if the camelbak's bladder is held up high enough (higher than the valve) liquid will flow through it while pinching the bite valve open (without sucking).
When I'm cleaning mine out I hold the bladder up at head-level and run water through the tube by just pinching the valve. You only have to suck when you've got the bag on your back and you're bringing the bite-valve up to your mouth...because then gravity isn't working for you.



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