Best Pick
⚠ DIM +45 lb100% Perfect fit15 Pack 24x18x18 Kraft Cardboard Carton Mailer Shipping Corrugated Packing Boxes
24″ × 18″ × 18″
+$0.00 Seller Free shipping · 47 lb billed
$4.36
landed per box
pack of 15 · $65.40
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Cheapest 18×18×24 padded mailer
Compare real eBay prices for 18×18×24 shipping boxes with DIM-weight-aware shipping estimates.
Live listings — sorted by landed cost per box
⚠ DIM +45 lb100% Perfect fitBuy →
⚠ DIM +45 lb100% Perfect fit24x18x18 Corrugated Shipping Boxes 15/pk
24″ × 18″ × 18″
+$0.00 Seller Free shipping · 47 lb billed
$4.63
landed per box
pack of 15 · $69.45
⚠ DIM +45 lb100% Perfect fitUOFFICE Corrugated Boxes 18 x 18 x 24" - Pack of 10 Shipping Cartons
18″ × 18″ × 24″
+$0.00 Seller Free shipping · 47 lb billed
$5.24
landed per box
pack of 10 · $52.40
⚠ DIM +45 lb100% Perfect fitUOFFICE Corrugated Boxes 18 x 18 x 24" - Pack of 10 Shipping Cartons
18″ × 18″ × 24″
+$0.00 Seller Free shipping · 47 lb billed
$5.24
landed per box
pack of 10 · $52.40
⚠ DIM +45 lb100% Perfect fitLarge Moving Boxes 18x18x24 - Pack of 8 Boxes Plus 1 Roll of Tape
18″ × 18″ × 24″
+$0.00 Seller Free shipping · 47 lb billed
$5.25
landed per box
pack of 8 · $42.00
⚠ DIM +61 lb92% Perfect fitGRAINGER APPROVED 22XL31 PK 10 Shipping Box,24x18x24 in 22XL31
24″ × 18″ × 24″
+$9.99 Seller Calculated · 63 lb billed
$6.30
landed per box
$5.06 each
pack of 10 · $50.60
Showing 6 of 21 real listings. Want all of them with custom quantity and weight? Search now →
What fits in a 18×18×24 box
A 18 × 18 × 24 inch box holds 7,776 cubic inches (4.50 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 18×18×24 box, UPS and FedEx Ground compute a DIM weight of 56 lbs using their 139 divisor, while USPS Ground Advantage uses a 166 divisor, giving 47 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 18×18×24 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 18×18×24. Adjust weight, quantity, or size as needed — we'll re-rank for your exact scenario.