The Navy just bought these waterproof rucks for its SEAL and SWCC teams
MILITARY ARMY ACU MOLLE II PATROL ASSAULT PACK 3-DAY MISSION BACKPACK #97 | eBay
Amazon.com: T3 Tactical 3-Day Hydration Backpack, Security Tactical Bag and Day Pack, Heavy-Duty Camping and Outdoor Backpack (Multicam)…… : Sports & Outdoors
Kelty Map 3500 vs Maxpedition Falcon II backpack reviews | SEALgrinderPT