Round Rock Solid Compression Sack Large:

This compression sack is an instant classic. It is designed to easily compress lofty items such as sleeping bags and clothing to a nearly rock solid state.
Designed to evenly distribute pressure of compression and prevent bulging. The original—many have tried to duplicate this design, none have succeeded. Don't accept imitators! 

Colors: Assorted

Materials
210D Nylon

Features
•Compress your lofty items to a rock hard state without bulging
•Designed for years of use and abuse. Accept no substitutes!