5 quart collapsible canteen doubles as a flotation device

Recently we picked up several Viet Nam era 5qt collapsible canteens from military surplus and we've been thrilled with them. Not only do they hold five quarts (1.25 gallons) but they also hold air and can be used as a pillow and as an emergency flotation device. Versatile gear is invaluable! I am going to need to figure out a way to be able to use my Sawyer water filter with these collapsible canteens and I don't think that is going to be difficult a task.

NSN 8465-01-254-5759, MIL-C-44218

Gear I'm Using:

5 Quart Collapsible Canteen: https://ebay.to/31CqRHq
USMC Assault Pack: https://ebay.to/2MUe7J1
USMC FILBE Hydration Carrier: https://ebay.to/31DUQif
Sawyer Squeeze Water Filter: https://amzn.to/2KojGgz
Sawyer Permethrin: https://amzn.to/2RnYmbR
Sawyer Picaridin Insect Repellant: https://amzn.to/2XjYUVG
Coyote Brown Paracord: https://amzn.to/2WNJV1K
Boonie Hat, Multi-cam: https://amzn.to/2WRDw5E
Grand Trunk Ultralight Hammock: https://amzn.to/2Zxdg26

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