Uline S-4500 Equivalent: 20 x 20 x 6" Flat Boxes (15-pack)
Model-to-size mapping verified against Uline’s published catalog listings on July 31, 2026; the Packrift price below is our live catalog price.
Uline model S-4500 is a 20 x 20 x 6" flat box per Uline’s published listings. The Packrift exact-size equivalent — same length × width × height, same grade class — is 20x20x6" ECT-32 Kraft Corrugated Boxes - Shallow Depth, Bundle of 15, priced at $40.40 per 15-pack ($2.69 per box) today.
| Size | Grade class | Pack | Price today | Per box | |
|---|---|---|---|---|---|
| Uline S-4500 | 20 x 20 x 6" | Flat Box | see your invoice | see your invoice | — |
| Packrift equivalent | 20 x 20 x 6" | Flat Box | 15 | $40.40 | $2.69/box |
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Frequently asked questions
Is this the same box as Uline S-4500?
It matches S-4500’s published dimensions (20 x 20 x 6") in the same grade class, so it packs and stacks the same. It is not manufactured by or affiliated with Uline — when replacing a certified spec, match the certificate stamp printed on the box.
What if my Uline model isn’t listed here?
The cross-reference currently covers 634 verified models across boxes and mailers. Enter yours in the lookup tool, or request a quote with the model number and we’ll match it by spec.
Uline is a registered trademark of Uline, Inc. Packrift is not affiliated with Uline; model numbers are referenced for size-compatibility comparison only.