This is a critical addition for your ALICE pack, or for your FILBE or Mystery Ranch pack, or whatever you throw over your shoulders to carry your clothing and gear.
This is a G.I. wet weather clothing bag. I have three available in used, excellent condition. The bags may have tiny pin holes, which is common for used wet weather bags, but they are still serviceable and will still protect your clothing. They are free of major holes or tears. The rubber is still pliable. All bags are dated in the 1990's.
As any grunt who lugged his ALICE pack in the rain can attest, these bags are a necessity. The basic design hasn't changed in decades. The rubberized nylon versions are lightweight and rugged. I prefer these for the main compartment of my rucksack over more current compression designs due to the ease of access in the dark.