Best Pick
⚠ DIM +47 lb100% Perfect fitGRAINGER APPROVED 493T86 PK 10 Shipping Box,20x20x20 in 493T86
20″ × 20″ × 20″
+$9.99 Seller Calculated · 49 lb billed
$3.50
landed per box
$2.50 each
pack of 10 · $25.00
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Cheapest 20×20×20 padded mailer
Compare real eBay prices for 20×20×20 shipping boxes with DIM-weight-aware shipping estimates.
Live listings — sorted by landed cost per box
⚠ DIM +47 lb100% Perfect fitBuy →
⚠ DIM +47 lb100% Perfect fitGRAINGER APPROVED 55NN04 PK 15 Shipping Box,20x20x20 in 55NN04
20″ × 20″ × 20″
+$9.99 Seller Calculated · 49 lb billed
$4.17
landed per box
$3.50 each
pack of 15 · $52.50
⚠ DIM +47 lb100% Perfect fit20x20x20 Corrugated Shipping Boxes 10/pk
20″ × 20″ × 20″
+$0.00 Seller Free shipping · 49 lb billed
$4.95
landed per box
pack of 10 · $49.50
⚠ DIM +47 lb100% Perfect fitUOFFICE 20x20x20" 275lb Heavy Duty Corrugated Boxes Pack of 10 Shipping
20″ × 20″ × 20″
+$0.00 Seller Free shipping · 49 lb billed
$4.99
landed per box
pack of 10 · $49.90
⚠ DIM +82 lb83% Snug fitGRAINGER APPROVED 493U23 PK 10 Shipping Box,24x24x24 in 493U23
24″ × 24″ × 24″
+$9.99 Seller Calculated · 84 lb billed
$5.73
landed per box
$4.28 each
pack of 10 · $42.80
⚠ DIM +47 lb100% Perfect fitGRAINGER APPROVED 22XM49 PK 10 Shipping Box,20x20x20 in 22XM49
20″ × 20″ × 20″
+$9.99 Seller Calculated · 49 lb billed
$7.49
landed per box
$6.49 each
pack of 10 · $64.90
Showing 6 of 18 real listings. Want all of them with custom quantity and weight? Search now →
What fits in a 20×20×20 box
A 20 × 20 × 20 inch box holds 8,000 cubic inches (4.63 cu ft) of interior space, putting it in the extra-large-cube category. It's a popular choice for shipping items like moving boxes, appliances, bulk household shipping — things that fit comfortably within those dimensions while leaving room for protective padding. Large boxes at this size are usually sold in smaller bulk packs — 10 to 25 — because storage and shipping of the empty stock itself becomes a consideration.
Shipping math for this size
Shipping cost for this size depends heavily on dimensional weight. For a 20×20×20 box, UPS and FedEx Ground compute a DIM weight of 58 lbs using their 139 divisor, while USPS Ground Advantage uses a 166 divisor, giving 49 lbs. Carriers bill whichever is greater — your actual weight or the DIM weight. USPS's higher divisor makes it roughly 9 lbs cheaper than UPS/FedEx for this size when your item is light, which is why our search results factor in DIM-weight automatically instead of just showing sticker prices.
How to pick the right pack size
When buying a 20×20×20 box, the biggest cost lever isn't which retailer you pick — it's which pack size you commit to. A 100-pack typically costs 2-3× more than a 25-pack but brings the per-unit cost down by 40-60%. Our ranking is based on **landed cost per box** — the pack price plus shipping, divided by the number of boxes. A 100-pack with $10 shipping works out cheaper per box than a 25-pack with the same shipping, because the fixed cost spreads further. Every listing below links to a real product page from eBay, ULINE, or other retailers; we don't show placeholder results.
Search with your own dimensions
Pre-filled with 20×20×20. Adjust weight, quantity, or size as needed — we'll re-rank for your exact scenario.