Columbia Backpack only used it for one week trip. Unisex. Like new. Perfect for a backpacking trip, you can take it with you on the airplane as a carry-on. It says is 60L but the dimensions don't exceed those aproved for carry-on luggage on airplanes. Details of the backpack: Externally accessible reservoir sleeve Compression straps Aluminum frame Two water bottle pockets Reflective zipper pulls Top external pocket