Best Pick
eBayeBay Brand Central⚠ DIM +11 lb
3” eBay Sticker – Red, Blue, Green and Yellow — 500 Stickers
12″ × 12″ × 12″
+$28.50 UPS Ground · 13 lb billed
$0.09
each
pack of 500 · $45.00
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Cheapest 12×12×12 padded mailer
Compare real eBay prices for 12×12×12 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 +11 lb
Comic Book Mailer Filler Pads — 50 Corrugated Sheets
12″ × 12″ × 12″
+$28.50 UPS Ground · 13 lb billed
$0.48
each
pack of 50 · $24.00
eBay⚠ DIM +11 lb
GRAINGER APPROVED 3AFT9 PK 25 Shipping Box,12x12x12-6 in 3AFT9
12″ × 12″ × 12″
+$28.50 UPS Ground · 13 lb billed
$1.28
each
pack of 25 · $32.00
eBay⚠ DIM +11 lb
12x12x12 Corrugated Shipping Boxes 25/pk - The Boxery
12″ × 12″ × 12″
+$28.50 UPS Ground · 13 lb billed
$1.58
each
pack of 25 · $39.50
eBayeBay Brand Central⚠ DIM +11 lb
Tissue Paper – Red, Blue, Green, and Yellow Multi-Pack 20” x 30”
12″ × 12″ × 12″
+$28.50 UPS Ground · 13 lb billed
$1.64
each
pack of 20 · $32.80
eBay⚠ DIM +11 lb
25 12x12x12 Cardboard Paper Boxes Mailing Packing Shipping Box Corrugated
12″ × 12″ × 12″
+$28.50 UPS Ground · 13 lb billed
$1.93
each
pack of 25 · $48.25
Showing 6 of 9 real listings. Want all of them with custom quantity and weight? Search now →
What fits in a 12×12×12 box
A 12 × 12 × 12 inch box holds 1,728 cubic inches (1.00 cu ft) of interior space, putting it in the large-cube category. It's a popular choice for shipping items like kitchen appliances, speakers, multiple books — 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 12×12×12 box, UPS and FedEx Ground compute a DIM weight of 13 lbs using their 139 divisor, while USPS Ground Advantage uses a 166 divisor, giving 11 lbs. Carriers bill whichever is greater — your actual weight or the DIM weight. USPS's higher divisor makes it roughly 2 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 12×12×12 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 12×12×12. Adjust weight, quantity, or size as needed — we'll re-rank for your exact scenario.