Bags of this size are generally considered to be day bags and are not suitable for travelling or long excursions. They are suitable as small school bags, or just for carrying a few items around.
If you are travelling, a bag of this size may be useful to carry a few food items and drinks around with you during the day whilst leaving your main rucksack at your accommodation.
Consider getting a bag with a small additional pockets or internal pockets for quick and easy access to important documents or passports. As usual, reflective tabs or straps are a good safety feature if it will be used at night.
Compression straps or similar features are likely to be unimportant on a bag of this size. But as you may be wearing it for long periods during the day, comfort is important. Consider adjustable straps so that you can fit it to suit you perfectly.
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