Suitcase Capacity Claim vs. Box Volume Comparator

Last updated 2026-08-24

Every suitcase product page states an exterior size in inches or centimeters and a capacity in liters. Multiplying height by width by depth gives the geometric volume of the box those exact dimensions describe — a fixed unit conversion, not a measurement, so it needs no lab and no independent tester. No page checks its own two numbers against each other. This one does.

Two of five already claim more than their own box holds. Briggs & Riley's own page states "19.75 x 14 x 9 in" for its Essential Carry-On's case — excluding wheels and handles — and "41 - 51 Liters." Multiplied out, 19.75 x 14 x 9 in is 40.8 L of box. The unexpanded 41 L claim is already 100.5% of it. it luggage's own listing does the same thing further: "55 x 36 x 21.5cm," 42.6 L of box, against a stated "43L" — 101%. Neither brand's own page does this arithmetic against itself; both numbers just sit next to each other, unchecked.

When the claim exceeds the box

A box has a hard geometric ceiling: H x W x D, converted to liters. A claim at or above 100% of that ceiling leaves no allowance at all for the case's own shell thickness, internal structure or wheel housings — and a claim genuinely above 100% describes more space than those exact outer dimensions can physically contain, unless the case expands beyond the dimensions stated or the two numbers on the page do not both describe the same configuration. This tool flags either case plainly rather than only reporting a percentage.

Every figure, unfiltered

This table doesn't depend on what you typed above — every figure this page cites, straight from each brand's own current product page.

Brand	Model	Their own stated dimensions	Wheels/handles basis	Their own claimed capacity	Box volume (computed)	Claim as % of box

What this does not do

It does not know how much you can actually pack. Real usable space is always less than the geometric box — shell walls, rounded corners, internal padding, dividers and irregular packed items all cost real liters this arithmetic does not see. A claim well under 100% is not itself proof of an honest number; it is proof only that the claim does not exceed the one hard ceiling this tool can check.
It does not adjudicate whether "exterior dimensions" should include wheels and handles at all — it only reports whether the brand's own page says so, and flags it plainly when the page says nothing.
It compares one model's unexpanded state per brand. Expandable cases' larger, expanded capacity is not checked here unless the page also states the expanded dimensions to multiply out — Briggs & Riley's own 51 L expanded figure is named above for that exact reason and left out of the table.
It is not a recommendation on which suitcase to buy — only whether a claimed capacity fits inside the box its own stated dimensions describe.

Runs entirely in your browser. Nothing you type is sent anywhere. Box volume uses the exact 1 in³ = 16.387064 cm³ conversion. it luggage's wheels/handles policy is stated on its own "How We Measure Guide" page. The backpack volume claim comparator found the same "a brand's own capacity claim disagrees with an independently-checkable figure" shape in a different market, there using a third party's physical measurement instead of geometry, and the dog crate interior space comparator found the same "the printed number oversells the real space inside" shape again, comparing one brand's own interior chamber figure against another's.