I have two Avail packs, I wouldn’t think of them as a “backpack” but more as a beefed up book bag or rucksack. It does have a frame sheet with stays and load lifter straps so it is closer to a “backpack “ than a book bag or rucksack. But because it only comes with a one size fits all belt and the shoulder straps are sewn on and not adjustable I don’t consider it a true backpack. It is great for a grab and go bag. If you are looking at a pack I would recommend the Krux frame from Stone Glacier. My daughter uses one of mine and she is 5’4” and 118 lbs.