|First of all, this is a genuine USA-made USGI part, and is the outside shell for the almost-current ECW Sleep System. This is real brand-name Gore-Tex breathable material, seam-sealed to become water-proof against rain/snow and almost air-proof. If you are small (5'-2" or smaller) there is room for your boots and pack in there, too.
My bag is nearly Grade I, probably owned by an Air Force user who was always authorized a bed in a hotel. No marks, punctures, burns, or stretched stitches. Nice.
To buy something almost-similar from a famous 3-letter outdoor Co-op is about $200, and it's probably not as sturdy.
I ordered 2 more as back-up. Fantastic unit, great deal.