Nathan intensity

ok so I may be being completely stupid here but I just got my Nathan intensity pack today ( I thought it would be a good option instead of a belt for my marathon training) but having tried it tonight I am wondering if there is a way to keep the water in the tube after drinking rather than having to suck the water all the way back up the tube (therefore taking in a lot of air) before getting to the water each time. I would like to wear it on a run tomorrow so if anyone has any ideas they would be greatly recieved.

Also hello again haven't posted in ages hope everyone is well x

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