Full disclosure: I am an Osprey fanboy and own several Osprey packs. After more than 100 nights of living out of this bag (over the past year and a half), this pack has become my best friend while on the road. It easily carries everything I need and still offers a little extra room should I find something along the way I can't live without. -The key is learning how to pack. The pockets are placed in great spots and the bag is very well constructed like Osprey is known for. The top pocket makes getting through TSA a breeze because I can easily stow my necessities with ease before going through the scanners. My pack has been on both international and domestic travel and I have not experienced any issues fitting it in an overhead bin, nor have I ever been asked to check the size before boarding. It rolls very easily unless I am going down the aisle on a plane, then it must be carried, which is really the only con I have. If you are only going to be spending one or two nights living out of a bag, this is probably a little large for your needs. I intend to buy the 36L to use on shorter trips.