I have a 511 tactical covrt backpack and this i basically keep permanently installed as i often end up in dry datacenters and having a source of cold fresh water any time is a game changer when youre deep doing maintenance and have to stop to find a 1980s vintage drinking fountain on the other side of the building many of these sites are unmanned and go months without seeing human life

Its also incredibly handy for ingress play to have water with you no matter where the game takes you