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I personally have the 36L bag, and Ive used it as a personal-item only bag on about 10-15 trips by now on several different airlines including EasyJet, RyanAir, and WizzAir without any issues

Instead of having to load your trike into the car, if you can even manage that, you can ride all the way there and back

Any bigger, and you risk back aches from carrying too much

Ease of Carrying: Even though personal items are small and arent generally heavy youre still going to have to carry it around so a bag that feels good on your shoulders and has cushioned straps is important

Casco claims the round shape is ideal for those who do not keep the aero tail tucked down on the shoulders