Extra capacity needs an identifiable job
The 38L makes a clearer case if the 30L would require removing items you consistently need or adding another bag. It is less compelling when you habitually travel with a compact kit. Check whether the packing cells accommodate your clothing categories and whether bulky items can use the available space without fighting that organization.
Think through carrying and transit
Tuck-away shoulder straps are a listed feature, so inspect how they operate and when you would use them. Also verify the laptop pocket's dimensions before making this your only travel bag. Compare the packed exterior with the rules for each relevant carrier and fare, especially if a smaller allowance constrains your route.
Compare it with your actual load
Put this model beside another backpack in the comparison tool. Missing figures stay marked as unknown, so you can see which measurements need checking before you buy.
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