It collapses into this little pouch about six inches long, secured with a snap. When you open it, you get a pretty fair-sized tote bag and the integral stuff sack is now an interior pocket that can be snapped closed.
The zipper closure appears to be pretty quality hardware. The bag itself is sewn from a single piece of water-resistant ripstop nylon and the carrying strap has a microfiber pad that is textured to keep it from sliding off your shoulder if you carry it slung.
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