They arent as good as a running tap but horses for courses. Other good things about them is.
Prop them in a corner of camp Id guess the large give you five or six kilos.
Slide them under the surface scum to collect clean(er) water under.
Prop them under a trickle to collect, or tuck them into hard to get to reach spots.
Rubbish removal
Over sucking chest wounds if some drug scum shoots you while pilfering his stash in a qld national park
Generally have a few that live between the harness and pack.
Dont try to save twenty cents a pack on elcheapo. Glad seem to work well. Some of mine make multiple trips.
The hercules brand have a mamoth ziplock but the bottoms of every single one of them Ive used splits open. Use em round the kitchen or hoist em.