Best Pick
eBay⚠ DIM +1 lb
100 12x6x6 Corrugated Kraft Cardboard Cartons Mailer Shipping Packing Box Boxes
12″ × 6″ × 6″
+$12.40 USPS Ground Advantage · 3 lb billed
$0.71
each
$0.834 landed
pack of 100 · $71.00
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Cheapest 12×6×6 padded mailer
Compare real eBay prices for 12×6×6 shipping boxes with DIM-weight-aware shipping estimates.
Live listings — sorted by landed cost per box
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eBay⚠ DIM +1 lb
100 12x6x6 Cardboard Paper Boxes Mailing Packing Shipping Box Corrugated Carton
12″ × 6″ × 6″
+$12.40 USPS Ground Advantage · 3 lb billed
$0.74
each
$0.864 landed
pack of 100 · $74.00
eBay⚠ DIM +1 lb
GRAINGER APPROVED 11R201 PK 25 Shipping Box,12x6x6 in 11R201
12″ × 6″ × 6″
+$12.40 USPS Ground Advantage · 3 lb billed
$0.49
each
$0.986 landed
pack of 25 · $12.25
eBay⚠ DIM +1 lb
50 12x6x6 Cardboard Paper Boxes Mailing Packing Shipping Box Corrugated Carton
12″ × 6″ × 6″
+$12.40 USPS Ground Advantage · 3 lb billed
$0.80
each
$1.05 landed
pack of 50 · $40.00
eBay⚠ DIM +2 lb
100 12x9x6 Cardboard Paper Boxes Mailing Packing Shipping Box Corrugated Carton
12″ × 9″ × 6″
+$14.50 USPS Ground Advantage · 4 lb billed
$0.98
each
$1.13 landed
pack of 100 · $98.00
eBay⚠ DIM +2 lb
GRAINGER APPROVED 11R212 PK 25 Shipping Box,12x9x6 in 11R212
12″ × 9″ × 6″
+$14.50 USPS Ground Advantage · 4 lb billed
$0.64
each
$1.22 landed
pack of 25 · $16.00
Showing 6 of 31 real listings. Want all of them with custom quantity and weight? Search now →
What fits in a 12×6×6 box
A 12 × 6 × 6 inch box holds 432 cubic inches (0.25 cu ft) of interior space, putting it in the medium-category. It's a popular choice for shipping items like hardcover books, shoes, small electronics — things that fit comfortably within those dimensions while leaving room for protective padding. Bulk packs of 25, 50, and 100 are the common listing sizes, with per-unit pricing typically between $0.60 and $2.00 depending on quantity and seller.
Shipping math for this size
Shipping cost for this size depends heavily on dimensional weight. For a 12×6×6 box, UPS and FedEx Ground compute a DIM weight of 4 lbs using their 139 divisor, while USPS Ground Advantage uses a 166 divisor, giving 3 lbs. Carriers bill whichever is greater — your actual weight or the DIM weight. USPS's higher divisor makes it roughly 1 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 12×6×6 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 12×6×6. Adjust weight, quantity, or size as needed — we'll re-rank for your exact scenario.