A comment on a diferent thread got me thinking about the weight of a filter vs aqua mira and so on. the statement was that if you weighed the weight against the immediate usage you might be able to save some weight by filtering. for example instead of a 70 oz hydration bag and aqua mira you might take a 1 qt nalgene and a filter. By tanking up on water while still at the source you only have to carry a small supply on the actual hike.

I dont have an accurate scale so would someone check this....

maybe:
70 oz platy full = 5 lbs
Aqua mira = 4 oz

total 5 lb 4 oz
vs.

first need purifier 18 oz
1 qt nalgene 2 lbs

total 3 lbs 2 oz


I chose these scenarios because my normal is/was
first need purifier 18 oz
70 oz platy 5 lbs

hence I was carrying over 6 lbs

I dont think carrying only a quart on a hot summer day is enough by the time you factor in the half hour wait for the chems since you can sweat out that much just sitting in the shade and I am assuming that drinking untreated water is not a viable choice.