Packed Volume: the Number Nobody Publishes and Everybody Needs
Weight is the number every gear listing leads with. Volume is the number that decides whether the thing goes in the bag, and hardly anyone publishes it in a form you can compare.
Makers give you a stuff-sack size — sometimes two numbers, sometimes three, in inches or centimetres, in whatever order suits them. We parse those into litres for every product that publishes one. That is 113 of the 237 products here, and it makes some things visible that a spec sheet never will.
The largest sleep item here packs bigger than the largest tent
The Cascade Designs Therm-a-Rest Z Lite Sol takes 9.3 litres packed. The largest shelter we hold a packed size for, the Paria Outdoor Products Bryce 2P, takes 8.
Before that becomes a gotcha, the qualification that matters: a packed size is displaced volume, not squashability. Some of the largest figures on this page belong to things that do not compress at all, which is exactly why they end up strapped to the outside of a seat pack rather than inside one — the volume is real, it just does not have to live in your luggage.
What it does mean is that the category name is not the decision. Between the smallest and largest sleep item here there is a 11.6× spread, and no amount of shopping by weight tells you which end of that you bought.
How much a category actually varies
Sorted by how far the largest is from the smallest. Categories with fewer than 5 products that publish a packed size are left out rather than turned into a ratio from two items. Where the smallest item is under 1 litre the multiple is left blank — a ratio against a figure rounded to a tenth of a litre says more about the rounding than the gear.
The categories at the top of that table are the ones where a packing list lies to you. “seat bag”, “sleep system”, “handlebar bag” are not quantities — they are ranges wide enough that two riders with identical kit lists can be carrying completely different amounts of stuff.
What that means for a seat pack
We hold measured dimensions for 17 seat packs, which compute to between 4.1 and 18 litres. The median is 13.
So the Cascade Designs Therm-a-Rest Z Lite Sol alone would be 72% of a median seat pack, and the smallest shelter we track — the Borah Gear Cuben Fiber Tarp at 0.6 L — would be under a tenth of it. Those are the two ends of the same decision.
Every product page here that publishes a packed size now shows it drawn to scale inside the smallest bag on this site with room for it, at the same scale as every bag and shelter drawing. That is a more useful answer than a number, because the question was never "how many litres" — it was "does it go in the bag I already own".
The caveat that matters
These comparisons are volume against volume, with a check that the item is not longer than the bag. They are not a packing simulation. A stuff sack is not infinitely squashable, a quilt will fill an awkward corner that a pot will not, and the order you pack in changes what fits. Treat the figures as "comfortably", "tight" and "no", not as a promise.
And where a maker publishes nothing, we hold nothing. 124 of the products here have no packed size we can read, and they are absent from every number above rather than estimated into it.
If you want to work the other way round, the bag finder starts from your bike and tells you which bags fit the frame — and reports how many it had to exclude for missing data instead of quietly dropping them.
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