Check out
Booq Bags. We've had three of them and have been very pleased with the quality. I don't know if they are waterproof, as I never had the backpack style. Just the Vyper sleeve and a satchel.
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Steve - Lorain County, Ohio
1992 Bridgestone RB-T
1993 Trek 970 SingleTrack
Xtracycle conversion on 1997 KHS Summit X