Review on Osprey Ultralight Stuff Pack Shadow: Convenience at Its Finest by Hector Trung

If you are debating whether to go for this or the Sea to Summit I can explain the differences. The Osprey is "better" and has mesh bibs, an external water bottle pocket and an overall "more complete" look. However, it doesn't fold up as compactly as the Sea to Summit. If you want to carry your backpack in your pocket, the Sea to Summit is the best choice. If you're going to use it as a backpack when you travel and put it in a large holdall or luggage, choose the Osprey. If you have patch pockets on your pants, the Osprey would also be a better option. Sea to Summit basically only "wins" if you want to pack the smallest size to always have an "emergency" backpack with you.