>>2021400They're just fast easy to fill up compared to other options. I was also bothered by not being able to hang them upside down to build a gravity filter which is how I rig up my CNOC bags when I get to camp.
>>2021594Basically take one of these caps and screw it to a bag then squeeze the water back into just like you would with the syringe that comes with the filter. Just be sure the use filtered water when doing this so you don't dirty up the wrong end.
