I am surprised to read comments about water bottles falling out. This is clearly not a 'proper' daypack - see the various daypacks Osprey makes for serious hiking. This pack is excellent for when you're travelling and want something small and light. It also makes for a perfect 'personal item' when doing air travel and can thus be in addition to your main carry-on item (though of course check). When you want to bring a small day pack for casual use, which could include some hiking, without bringing a full-on day pack this is perfect. If you want a proper daypack for extended hiking then you might want to spend a bit more. I have both - this for casual use and a bigger day pack for 'proper' hikes and similar.