1) when using these, the mouthpiece is above the water level - do you have to suck & build up a vacuum to get any fluid?
2) why is the Source Hydration Convertube twice the price of just buying a complete system?
3) where do you pack them in a normal rucksack (one without a dedicated compartment)?
2) why is the Source Hydration Convertube twice the price of just buying a complete system?
3) where do you pack them in a normal rucksack (one without a dedicated compartment)?