The Summitrocket 30L is as light as MHW claims. It's comfy when loaded, and stashes well when not in use. It seems well built, though well built of very light fabrics. But if it's half full, and you cinch down the compression straps on the sides, the straps pull the bottom of the pack up, they do not squeeze the pack skinnier. It's kind of weird. You end up with the pack in an "S" curve. It has a lot to do with the corrugated plastic piece they use to give the pack some form. It's all but inflexible horizontally but very flexible vertically. You can easily roll the pack up from the toplid to the bottom. If I can figure how to keep things from getting funky I'll give this pack a 4 star rating. If I can't, it get's a 3 star, as it's still superlight and well built, but I shouldn't have to fenagle anything at $150. That was Ueli's job.