So basically you're using it as a water holding device, only it weighs 10x more than a bladder and it has no way of stopping the flow.
You guys should try something like a Evernew 2L bladder together with a Sawyer filter.
The full sized filters have a push top that stops the flow, on the mini's you have to get a bit more creative as there is no stop tap.
I use a binder clip to hold the outlet let shut.
Works great, is easier to find and a millbank bag, actually filters water to a state of being drinkable (in the UK at least) is light weight and works a million times better than a old duff millbank bag.
Failing that just try a platypus or evernew water bladder.
You guys should try something like a Evernew 2L bladder together with a Sawyer filter.
The full sized filters have a push top that stops the flow, on the mini's you have to get a bit more creative as there is no stop tap.
I use a binder clip to hold the outlet let shut.
Works great, is easier to find and a millbank bag, actually filters water to a state of being drinkable (in the UK at least) is light weight and works a million times better than a old duff millbank bag.
Failing that just try a platypus or evernew water bladder.