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I would just get a regular school-style backpack for daily use. If you want a cool one, take a look at Maxpedition stuff. Ultralight backpacks tend to need a lot of stuff in them or else they are awkward to carry. They also tend to be built for infrequent access to the stuff inside them. You normally only unpack your sleeping bag, tent, food, etc. once or maybe twice a day, while keeping your snack food and water in the outside pockets. Daily use backpacks really need to be more accessible so you can get to the main compartment whenever you want.