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I have two day packs. One is an REI Flash 22(I know, I know, but its a nice light day pack that holds all the shit I need) that I carry in my osprey atmos 65L for when I leave my gear at the camp site and go out for a bit during the day while backpacking. Pic Related.
Second is my 5.11 24rush pack. Personally i think this bag is a little bit too big for a day setup. its really impressive how much room it has and it gives you the tendency to over pack it. I use this bag mostly as a bugout bag/work/going to my gfs house bag. fits all my stupid shit plus some.