I am delighted by the quality of this backpack.  I needed a light weight waterproof day pack for hiking that was sturdy enough to carry my hiking poles.  The super lightweight packs have no structure, and I really wanted one that would not collapse.  This works perfectly and is big enough to carry my poles which fold up to 14 inches. The pack has only one big chamber and an outer pocket, but it fits an amazing amount of stuff.  In fact, I can fit all my hiking gear in it (3 t shirts, 3 pairs socks, fleece jacket, rain jacket, two pairs hiking pants, pair of rain pants, down vest, gloves, hat and hiking poles) and put it inside my 21 inch carry on with enough room left over for my urban clothes, hiking boots and toiletries.  Couldn't be more pleased!  Admittedly my hiking gear is in smaller sizes and made of light and packable materials, but there is still a LOT of room in a relatively small pack.