This is not something you want if you are worried about weight and bulk. it does not compress well. It is not too easy to use either. My backpack is rather large (85 ltr) and it fit with poles, and boots attached to the exterior of the pack. I know that most airlines will bag your pack with a large plastic bag-like they use for baby carriers if you request it. (its free for now). Or you can use a really heavy duty construction garbage bag or two.

If you do purchase this, keep this is mind:
1. It is difficult to carry via the shoulder strap. Wait until you get to the check in counter to use it.
2. Make sure you duct tape any sharp edges such as a pick ax or poles. It is not sturdy enough to handle sharp edges.
3. It is way overpriced