Uline S-21546 Equivalent: 18x16x12" 32 ECT Boxes (25-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-21546 is a 18x16x12" Lightweight 32 ECT box per Uline’s published listings. The Packrift exact-size equivalent — same length × width × height, same grade class — is 18x16x12 Shipping Boxes — ECT-32 Kraft Corrugated, 25-Pack, priced at $66.70 per 25-pack ($2.67 per box) today.
| Size | Grade class | Pack | Price today | Per box | |
|---|---|---|---|---|---|
| Uline S-21546 | 18x16x12" | 32 ECT | see your invoice | see your invoice | — |
| Packrift equivalent | 18x16x12" | 32 ECT | 25 | $66.70 | $2.67/box |
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Frequently asked questions
Is this the same box as Uline S-21546?
It matches S-21546’s published dimensions (18x16x12") 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 240 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.