How-to · Outdoor

Deck Box Size Guide

Gallons describe the box. They do not describe your cushions.

How-to guideUpdated September 30, 2026

A stack of patio cushions with a tape measure — Illustration. Measure the stack you actually have.

Quick method: Stack the dry cushions the way you will store them and measure length, width, and height. Compare that bundle to the inside of the box, not to the gallon number. Leave room for the lid to close and for you to walk past.

The stack, then the inside

Stacked seat cushions with a tape measure on top — The bundle. Height stacks faster than people expect.

Tape measure inside an empty deck box — The inside of the box. This is the number that has to beat the stack, with the lid able to close.

How to measure

Dry the cushions first. A damp stack should not go in either box. See winter storage.
Measure the stacked bundle, then the interior, not the outside shell.
Set the box where it will live and walk past it. A larger gallon size that blocks the door is the wrong size.

What not to do

Do not step up in gallons because a listing says it holds a dining set. Your cushions are the measurement.

Related guides

Wicker vs heavy-duty deck boxes
Store patio cushions for winter