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" ... Pack & Hydration: Ideally you want to carry as little as you need, while being able to carry what you really should have, including rain gear, layers, a snack, first aid kit, water, etc. Packs are rated by capacity in liters, and generally 45 and above is a backpack meant for overnight travel. Full size daypacks run in the 25-40 rage, while 20 and under tend to be streamlined light day packs for carrying water and few essentials. This can be fine if you have multiple packs, but if you are looking for just one, I’d suggest something around 30 that can do it all, from a short outing to a full change of clothes and layers in cool weather. ... "