"Solid Pack for Summit Days, Not for Long Distance Light-Weight Backpacking"
This is a great pack to carry in your main pack for a summit attempt. I used it on Rainier and it cut the weight by a few pounds over the summit pack I took previously. It is extremely light weight (about 11 ounces I think). When you are counting grams, this is a pack you can count on. It is easily packable in your main pack (I use it in a 60 liter main pack, and it takes up very little space).
The construction of this pack is so lightweight that it almost seems unreal. Everything from the webbing straps to the material that makes the body of the pack is surprisingly thin, but do not let this fool you it is strong for its size and has held up well so far. I would recommend this product to friends but I would not over pack after all it is a day pack.