Highly reccomend a MOLLE water bottle pouch for the Backpack. : r

HYDRA Bottle Holder is a modular “one-size-fits-all” MOLLE-compatible pouch to keep you hydrated on your adventures. Made with grippy Hypalon rubber

HYDRA Water Bottle Holder - Vanquest Tough-Built Gear

Water Bottle Holders - HighSpeedDaddy

Best Water Bottle & Carry Pouch (MOLLE, Belt System) - Scramble Kit - Tested, Rated, Recommended — Scramble Kit UK

Pouch Review: Spiritus Systems Nalgene – ATRG

OID Kanteen Water Bottle Holder for Reusable Bottles. Attach to any bag. - OID Ltd

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ZXXSFM Molle Water Bottle Holder for Backpack,Molle Pouch,Water Bottle Carrier,Tactical Water Bottle Pouch,Tactical Molle Water Bottle Pouch Attaches to Backpack,Bicycle,Belt,Straps,Car（Black） : Sports & Outdoors

Baribal Insulated Tactical Pouch for Nalgene 1l Bottle

Full Panel Water Bottle Pocket – GORUCK