Should measure
Measure the Barley too while you're at it!
Surprisingly not easy to measure the width your own ass. The Barley's main compartment is 30cm and the whole thing with pockets stuffed full is about 42cm. So about the same as my thighs in riding position at that height.
You could try to enter various cupboards and then measure one where it's quite snug.
@Samuli started
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Measure the Barley too while you're at it!