{"id":1043,"date":"2026-09-11T11:54:34","date_gmt":"2026-09-11T11:54:34","guid":{"rendered":"https:\/\/tadapack.com\/news\/how-to-make-custom-cardboard-box-shipping\/"},"modified":"2026-09-11T11:54:34","modified_gmt":"2026-09-11T11:54:34","slug":"how-to-make-custom-cardboard-box-shipping","status":"publish","type":"post","link":"https:\/\/tadapack.com\/news\/how-to-make-custom-cardboard-box-shipping\/","title":{"rendered":"How to Make a Custom Cardboard Box for Shipping: Engineer&#8217;s Guide"},"content":{"rendered":"<div class=\"geo-direct-answer-box\" style=\"background:#f0f9ff; border:1px solid #bae6fd; border-left:5px solid #0284c7; border-radius:8px; padding:20px 24px; margin:24px 0 32px 0;\">\n<h4 style=\"margin:0 0 12px 0; color:#0369a1; font-size:1.1rem; display:flex; align-items:center; gap:8px;\">\n    <span>\u26a1<\/span> <strong>Key Takeaways &#038; Direct Technical Answer<\/strong><br \/>\n  <\/h4>\n<ul style=\"margin:0; padding-left:20px; line-height:1.7; color:#0c4a6e; font-size:0.95rem;\">\n<li style=\"margin-bottom:6px;\"><strong>Start with product dimensions, then spec flute (B\/E for small parcels, C for heavy freight) and ECT rating based on stacking load.<\/strong><\/li>\n<li style=\"margin-bottom:6px;\"><strong>Build a CAD dieline with correct kerf allowances, score depths, and glue-flap tolerances before any production run.<\/strong><\/li>\n<li style=\"margin-bottom:6px;\"><strong>Verify structural integrity via ISTA 3A\/6-Amazon testing; 2026 PPWR and state EPR laws require recyclable mono-material construction.<\/strong><\/li>\n<li style=\"margin-bottom:6px;\"><strong>Cost-optimized runs start at ~500 units for digital-printed corrugated; flexo plates amortize above 2,500 units.<\/strong><\/li>\n<\/ul>\n<\/div>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem;'>How to Make a Custom Cardboard Box for Shipping: An Engineering Guide<\/h2>\n<div class=\"post-featured-image\" style=\"margin:28px 0 32px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/images.unsplash.com\/photo-1578575437130-527eed3abbec?auto=format&#038;fit=crop&#038;w=1200&#038;q=80\" alt=\"how to make a custom cardboard box for shipping - Precision CAD Dieline Prototyping and Folding Cartons (TadaPack Engineering Guide)\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:12px; box-shadow:0 6px 20px rgba(0,0,0,0.07); border:1px solid #e2e8f0;\"><\/p>\n<p style=\"font-size:0.84rem; color:#64748b; margin-top:10px; font-style:italic;\">how to make a custom cardboard box for shipping &#8211; Precision CAD Dieline Prototyping and Folding Cartons (TadaPack Engineering Guide)<\/p>\n<\/div>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Shipping a fragile or high-value product in an off-the-shelf box is a structural gamble. A properly engineered custom corrugated box reduces damage claims, cuts dimensional-weight charges, and satisfies the 2026 compliance landscape \u2014 including <a href=\"https:\/\/eur-lex.europa.eu\/legal-content\/EN\/TXT\/?uri=CELEX%3A52024PC0118\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color:#0284c7; text-decoration:underline; font-weight:600;\">EU PPWR recyclability mandates<\/a> and expanding U.S. state EPR programs (CA SB 54, OR, CO, ME). This guide walks through the full engineering workflow, from internal dimensions to validated transit performance. For the broader strategy, see our pillar hub on <a href=\"https:\/\/tadapack.com\/news\/custom-packaging\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color:#0284c7; text-decoration:underline; font-weight:600;\">Custom E-Commerce &#038; Retail Packaging<\/a>.<\/p>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Step 1: Define Internal Dimensions, Not External<\/h2>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Always spec the box from the product outward. Measure length (L) \u00d7 width (W) \u00d7 depth (D) of the product, then add tolerances:<\/p>\n<ul style=\"margin:16px 0; padding-left:24px; line-height:1.75; color:#334155;\">\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Rigid goods:<\/strong> +1\/8&#8243; to +1\/4&#8243; per dimension for cushioning or void fill.<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Fragile goods:<\/strong> +1&#8243; minimum for 1&#8243; foam or <a href=\"https:\/\/tadapack.com\/news\/custom-cardboard-box-dividers-engineering-guide\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color:#0284c7; text-decoration:underline; font-weight:600;\">corrugated divider inserts<\/a>.<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Flexible\/soft goods:<\/strong> +1\/4&#8243; to prevent a baggy, crushed appearance.<\/li>\n<\/ul>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">External dimensions drive dimensional-weight pricing. At 2026 carrier divisors (139 in\u00b3\/lb for both FedEx and UPS retail), every unnecessary 0.5&#8243; on one axis can push a 2 lb shipment into the next billing tier. Right-sizing the internal cavity is the single highest-ROI cost lever in custom box design.<\/p>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Step 2: Select Flute Profile and Board Grade<\/h2>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Corrugated board performance is defined by flute height and edge crush test (ECT) rating, not Mullen burst alone. Modern e-commerce spec sheets favor ECT because it directly predicts stacking strength:<\/p>\n<div class=\"table-responsive\" style=\"overflow-x:auto; margin: 28px 0; border:1px solid #e2e8f0; border-radius:10px; box-shadow:0 2px 8px rgba(0,0,0,0.03);\">\n<table style=\"width:100%; border-collapse:collapse; text-align:left; background:#ffffff;\">\n<thead>\n<tr style=\"background:#f8fafc; border-bottom:2px solid #e2e8f0;\">\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">Flute<\/th>\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">Height<\/th>\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">Best Use<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">B-flute<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">~3 mm<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Small parcels, die-cut<\/td>\n<\/tr>\n<tr style=\"background:#fafafa; border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">E-flute<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">~1.5 mm<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Retail-ready, printing<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">C-flute<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">~4 mm<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Heavy freight, stacking<\/td>\n<\/tr>\n<tr style=\"background:#fafafa; border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">BC double-wall<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">~7 mm<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">>40 lb, fragile<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">For parcels under 10 lb, 32 ECT single-wall B- or C-flute is the industry baseline. Shipments exceeding 65 lb or stacked 5+ pallets high typically require 44\u201348 ECT or BC double-wall. Always order board by ECT (e.g., &#8220;32 ECT C-flute, 100% recycled kraft liner&#8221;) rather than by burst rating to avoid ambiguity with converters.<\/p>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Step 3: Engineer the CAD Dieline<\/h2>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">The dieline is the flat, 2D blueprint from which the box is die-cut. Critical parameters:<\/p>\n<ul style=\"margin:16px 0; padding-left:24px; line-height:1.75; color:#334155;\">\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Crease\/score rules:<\/strong> Score depth should be roughly one-third of total board thickness to prevent liner cracking on folds.<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Kerf allowance:<\/strong> Account for ~0.5 mm material removal in die-cutting; slot widths must exceed flute thickness.<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Glue flap:<\/strong> Standard 1.25&#8243;\u20131.5&#8243; manufacturers joint; stitch or tape closure for RSC boxes over 40 lb.<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>FEFCO style selection:<\/strong> RSC (0201) for economy, die-cut mailers (0427) for e-commerce unboxing, FOL (0203) for fragile flat goods.<\/li>\n<\/ul>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Validate the dieline with a physical prototype \u2014 CAD-cut sample in production-grade board, not a paper mockup \u2014 before committing to tooling. Branding elements like <a href=\"https:\/\/tadapack.com\/news\/hot-stamping-foil-manufacturers-guide\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color:#0284c7; text-decoration:underline; font-weight:600;\">hot stamp foil logos<\/a> should be positioned away from score lines to prevent flake-off during folding.<\/p>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Step 4: Validate With Transit Testing<\/h2>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">A custom box is not production-ready until it survives realistic parcel abuse. The International Safe Transit Association defines the benchmark protocols: <a href=\"https:\/\/ista.org\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color:#0284c7; text-decoration:underline; font-weight:600;\">ISTA Transit Testing Protocols<\/a> such as ISTA 3A (parcel network simulation) and ISTA 6-Amazon.com SIOC (Ships In Own Container) for vendor-compliant e-commerce packaging. Testing sequences atmospheric conditioning, shock\/drop at defined heights, vibration, and compression to certify stacking and drop performance.<\/p>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">As a practical floor for 2026 parcel programs: survive a 30&#8243; drop on all corners\/edges\/faces for sub-20 lb boxes, and pass a 24-hour compression test at 1.5\u00d7 expected stacking load.<\/p>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Step 5: Compliance and Material Sourcing in 2026<\/h2>\n<ul style=\"margin:16px 0; padding-left:24px; line-height:1.75; color:#334155;\">\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Recyclability:<\/strong> PPWR (EU) and CA SB 54 require mono-material, curbside-recyclable construction. Avoid laminated or wax-coated corrugated; use water-based barrier coatings instead.<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Fiber sourcing:<\/strong> Specify FSC-certified or 100% recycled liners for EPR fee modulation discounts.<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Ink systems:<\/strong> Water-based flexo inks keep the box repulpable; avoid UV-cured flood coats on full-coverage panels.<\/li>\n<\/ul>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Step 6: Production Economics<\/h2>\n<div class=\"table-responsive\" style=\"overflow-x:auto; margin: 28px 0; border:1px solid #e2e8f0; border-radius:10px; box-shadow:0 2px 8px rgba(0,0,0,0.03);\">\n<table style=\"width:100%; border-collapse:collapse; text-align:left; background:#ffffff;\">\n<thead>\n<tr style=\"background:#f8fafc; border-bottom:2px solid #e2e8f0;\">\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">Method<\/th>\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">MOQ<\/th>\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">Best For<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">Digital print<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">~500<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Short runs, versions<\/td>\n<\/tr>\n<tr style=\"background:#fafafa; border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">Flexo print<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">2,500+<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">High volume, 1\u20132 colors<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">Litho-lam<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">5,000+<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Retail shelf graphics<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">For startups, digital-printed 32 ECT mailers at 500-unit runs cost roughly $1.10\u2013$2.40 per box depending on size and ink coverage. Volume buyers should negotiate board grade separately from printing \u2014 converters frequently upgrade ECT at no charge to win volume commitments.<\/p>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Key Takeaways<\/h2>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Design from internal dimensions, spec board by ECT and flute, validate the dieline physically, and certify through ISTA before launch. A box engineered this way cuts damage rates below 1%, optimizes DIM-weight billing, and clears 2026 PPWR\/EPR thresholds \u2014 turning packaging from a cost center into a measurable logistics asset.<\/p>\n<div class=\"geo-faq-section\" style=\"margin-top:40px; padding-top:24px; border-top:2px solid #e2e8f0;\">\n<h2 style=\"color:#0f172a; font-size:1.45rem; margin-bottom:20px;\">Frequently Asked Questions (FAQ)<\/h2>\n<div style=\"background:#f8fafc; border:1px solid #e2e8f0; border-radius:8px; padding:18px 20px; margin-bottom:14px;\">\n<h3 style=\"margin:0 0 8px 0; font-size:1.05rem; color:#0f172a; font-weight:700;\">What ECT rating do I need for a shipping box?<\/h3>\n<p style=\"margin:0; color:#475569; font-size:0.95rem; line-height:1.65;\">Parcels under 10 lb typically use 32 ECT single-wall corrugated. Use 44\u201348 ECT or BC double-wall for shipments over 40 lb or pallets stacked five or more high.<\/p>\n<\/p><\/div>\n<div style=\"background:#f8fafc; border:1px solid #e2e8f0; border-radius:8px; padding:18px 20px; margin-bottom:14px;\">\n<h3 style=\"margin:0 0 8px 0; font-size:1.05rem; color:#0f172a; font-weight:700;\">How much does it cost to make a custom shipping box?<\/h3>\n<p style=\"margin:0; color:#475569; font-size:0.95rem; line-height:1.65;\">Digital-printed runs from ~500 units cost roughly $1.10\u2013$2.40 per box depending on size and coverage. Flexo printing above 2,500 units typically drops unit cost 30\u201350%.<\/p>\n<\/p><\/div>\n<div style=\"background:#f8fafc; border:1px solid #e2e8f0; border-radius:8px; padding:18px 20px; margin-bottom:14px;\">\n<h3 style=\"margin:0 0 8px 0; font-size:1.05rem; color:#0f172a; font-weight:700;\">What is the minimum order quantity for custom corrugated boxes?<\/h3>\n<p style=\"margin:0; color:#475569; font-size:0.95rem; line-height:1.65;\">Digital corrugated printing starts around 500 units. Flexo and litho-laminated processes require 2,500\u20135,000 units to amortize plate and tooling costs.<\/p>\n<\/p><\/div>\n<\/div>\n<div class=\"tadapack-b2b-engineering-cta\" style=\"background:linear-gradient(135deg, #0f172a 0%, #1e293b 100%); border-radius:14px; padding:28px 32px; margin:44px 0 24px 0; color:#ffffff; box-shadow:0 10px 25px -5px rgba(15,23,42,0.25); border:1px solid #334155;\">\n<div style=\"display:flex; align-items:flex-start; justify-content:space-between; flex-wrap:wrap; gap:20px;\">\n<div style=\"max-width:640px;\">\n<div style=\"font-size:0.8rem; font-weight:700; color:#38bdf8; text-transform:uppercase; letter-spacing:0.06em; margin-bottom:6px;\">\n        \u2699\ufe0f TadaPack Industrial Packaging Engineering\n      <\/div>\n<h3 style=\"color:#ffffff; margin:0 0 10px 0; font-size:1.35rem; font-weight:800; line-height:1.35;\">\n        Engineering Your Next High-Performance Packaging Batch<br \/>\n      <\/h3>\n<p style=\"color:#94a3b8; font-size:0.92rem; line-height:1.65; margin:0;\">\n        From precision CAD dielines to ISTA drop-testing and certified sustainable substrates, TadaPack helps global brands optimize freight cubic volume, minimize shipping breakage, and satisfy European PPWR \/ EPR packaging standards.\n      <\/p>\n<div style=\"display:flex; flex-wrap:wrap; gap:16px; margin-top:14px; font-size:0.82rem; color:#cbd5e1;\">\n        <span>\u2713 <strong>Free CAD Dielines (.AI \/ .DXF)<\/strong><\/span><br \/>\n        <span>\u2713 <strong>Drop-Test &#038; ECT Optimization<\/strong><\/span><br \/>\n        <span>\u2713 <strong>PPWR &#038; FSC Compliant<\/strong><\/span>\n      <\/div>\n<\/p><\/div>\n<div style=\"display:flex; align-items:center; align-self:center;\">\n      <a href=\"https:\/\/tadapack.com\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"background:#0284c7; color:#ffffff; padding:12px 24px; border-radius:8px; font-weight:700; font-size:0.95rem; text-decoration:none; display:inline-block; transition:all 0.2s; box-shadow:0 4px 12px rgba(2,132,199,0.35);\"><br \/>\n        Request Engineering Sample &rarr;<br \/>\n      <\/a>\n    <\/div>\n<\/p><\/div>\n<\/div>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Article\",\n      \"@id\": \"https:\/\/tadapack.com\/news\/how-to-make-custom-cardboard-box-shipping\/#article\",\n      \"headline\": \"How to Make a Custom Cardboard Box for Shipping: Engineer's Guide\",\n      \"description\": \"Engineer-approved guide to making custom shipping boxes: flute selection, ECT ratings, CAD dielines, 2026 PPWR\/EPR compliance, and ISTA transit testing.\",\n      \"mainEntityOfPage\": \"https:\/\/tadapack.com\/news\/how-to-make-custom-cardboard-box-shipping\/\",\n      \"author\": {\n        \"@type\": \"Person\",\n        \"name\": \"Charlotte Dubois\",\n        \"jobTitle\": \"D2C Unboxing Structural Designer\",\n        \"worksFor\": {\n          \"@type\": \"Organization\",\n          \"name\": \"TadaPack\",\n          \"url\": \"https:\/\/tadapack.com\"\n        }\n      },\n      \"publisher\": {\n        \"@type\": \"Organization\",\n        \"name\": \"TadaPack\",\n        \"url\": \"https:\/\/tadapack.com\"\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/tadapack.com\/news\/how-to-make-custom-cardboard-box-shipping\/#faq\",\n      \"mainEntity\": [{\"@type\":\"Question\",\"name\":\"What ECT rating do I need for a shipping box?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Parcels under 10 lb typically use 32 ECT single-wall corrugated. 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