Best Pick
eBayeBay Brand Central⚠ DIM +47 lb
3” eBay Sticker – Red, Blue, Green and Yellow — 500 Stickers
20″ × 20″ × 20″
+$72.00 USPS Ground Advantage · 49 lb billed
$0.09
each
pack of 500 · $45.00
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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 eBay listings — sorted by cost per useful box
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eBayeBay Brand Central⚠ DIM +47 lb
Comic Book Mailer Filler Pads — 50 Corrugated Sheets
20″ × 20″ × 20″
+$72.00 USPS Ground Advantage · 49 lb billed
$0.48
each
pack of 50 · $24.00
eBayeBay Brand Central⚠ DIM +47 lb
Packaging Tape – Color Logo — 36 rolls
20″ × 20″ × 20″
+$72.00 USPS Ground Advantage · 49 lb billed
$2.27
each
pack of 36 · $81.72
eBayeBay Brand Central⚠ DIM +47 lb
Tissue Paper – Red, Blue, Green, and Yellow Multi-Pack 20” x 30”
20″ × 20″ × 20″
+$72.00 USPS Ground Advantage · 49 lb billed
$1.64
each
pack of 20 · $32.80
eBay⚠ DIM +47 lb
GRAINGER APPROVED 55NN04 PK 15 Shipping Box,20x20x20 in 55NN04
20″ × 20″ × 20″
+$72.00 USPS Ground Advantage · 49 lb billed
$3.50
each
pack of 15 · $52.50
eBay⚠ DIM +47 lb
GRAINGER APPROVED 493T86 PK 10 Shipping Box,20x20x20 in 493T86
20″ × 20″ × 20″
+$72.00 USPS Ground Advantage · 49 lb billed
$2.50
each
pack of 10 · $25.00
Showing 6 of 12 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 *cost per useful box*, which gives bonus boxes partial credit — so a 100-pack can still win for single-box needs if the per-unit price is low enough, but a 25-pack often ranks higher when you only need a few. Every listing below links to a real eBay product page; 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.