Best Pick
Bulk lot 1000 pcs poly mailer 6x9 flat shipping envelopes, Valuemail #0 6"x9"
6″ × 9″ × 0″
+$0.00 Seller Free shipping · 3 lb billed
$0.050
landed per box
pack of 1000 · $50.00
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Cheapest 9×6×3 padded mailer
Compare real eBay prices for 9×6×3 shipping boxes with DIM-weight-aware shipping estimates.
Live listings — sorted by landed cost per box
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400 Combo Poly Mailers Bags Each 100 6x9 7.5x10.5 9x12 12x15.5 - ST ShipMailers
6″ × 9″ × 0″
+$0.00 Seller Free shipping · 3 lb billed
$0.070
landed per box
pack of 400 · $28.00
100 pcs 6"x9" Poly Mailer Plastic Packing Shipping Mailing Envelopes Bags
6″ × 9″ × 0″
+$0.00 Seller Free shipping · 3 lb billed
$0.090
landed per box
pack of 100 · $9.00
100 pcs 6"x9" Poly Mailer Plastic Packing Shipping Mailing Envelopes Bags
6″ × 9″ × 0″
+$0.00 Seller Free shipping · 3 lb billed
$0.090
landed per box
pack of 100 · $9.00
6x9 Poly mailers Self Sealing Tear-Proof Shipping Bags Premium Quality 100 Pack
6″ × 9″ × 0″
+$0.00 Seller Free shipping · 3 lb billed
$0.160
landed per box
pack of 100 · $16.00
eBay Brand Central9" x 11.5" Polyjacket/Polymailer — 400 Envelopes
9″ × 11.5″ × 0″
+$0.00 Seller Free shipping · 3 lb billed
$0.180
landed per box
pack of 400 · $72.00
Showing 6 of 89 real listings. Want all of them with custom quantity and weight? Search now →
What fits in a 9×6×3 box
A 9 × 6 × 3 inch box holds 162 cubic inches (0.09 cu ft) of interior space, putting it in the small-category. It's a popular choice for shipping items like small electronics, jewelry boxes, phone cases — things that fit comfortably within those dimensions while leaving room for protective padding. Most sellers list it in bulk packs of 25, 50, or 100, which brings the per-box cost under $1 for the cheapest options.
Shipping math for this size
Shipping cost for this size depends heavily on dimensional weight. For a 9×6×3 box, UPS and FedEx Ground compute a DIM weight of 2 lbs using their 139 divisor, while USPS Ground Advantage uses a 166 divisor, giving 1 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. For very light items, a USPS Priority Flat Rate envelope or small box may beat buying this size outright — we flag that when it applies.
How to pick the right pack size
When buying a 9×6×3 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 9×6×3. Adjust weight, quantity, or size as needed — we'll re-rank for your exact scenario.