Down River Barrel Pump RBS M has a lightweight GORE-TEX

M has a lightweight GORE-TEX PRO inner skirt as part of its adjustable double tunnel waist featuring Ariaprene

The secret is out

This is actually how Sawyer suggests you modify them if needed

Warranty: 5-Year Limited

The velcro stays put no matter what you put it through and the Beak can flip up and out of the way when you need it to

Down River Barrel Pump RBS M has a lightweight GORE-TEXThe Down River Barrel Pump has a reputation of being simple, solid and functional. These pumps are easy to take apart and clean so they stay dependable for you on all your river trips. Made in Denver, CO. Specifications Size Height Volume Weight Pump Efficiency PSI Tall 26. 5 in. 220 sq. in. 6. 5 lbs. 4: 1 6 Short 20 in. 157 sq. in. 6. 5 lbs. 4: 1 6 chrome chrome