Great question — answering as the UphillTech team:
Some backpacks have bottle pockets, some don't. In general such pockets are less likely on those designed to take hydration bladders* (because they don't need them), and those designed for climbing (narrower, without snaggy external pockets). You've got both - a "technical mountaineering" pack that's also hydration system compatible. A bottle that closes securely can always be put inside (but easy to unpack if it's not just a spare), but beware of condensation making important things damp if putting chilled water in your bottles on a humid day. But putting a bottle inside might mean you don't drink enough, or you have to stop to drink. I use this when leading to ensure I call enough stops -...
Full answer by Chris H: https://outdoors.stackexchange.com/a/30528 (CC BY-SA 4.0).
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