that's what i like about this forum - another good point raised.

rei sez the nalgene polycarb @ 32 oz / 1 litre weighs 6.2 oz. empty.

nalgene sez the same bottle weighs .33 lbs or 5.28 oz.

the gsi @ 1 litre weighs 7.2 oz. empty.

so 5.28 vs. 7.2..

it does make a difference. thank you for that.

for me, where i typically day hike, i carry 2, 3-litre camelback hydration bladders. yesterday i went through 1 3/4 bags in an 8 hour hike. temps were in the low 70s. and the hike was 95% sun exposed. but we did see water where typically isn't any.

the intent was to try to reduce the water carry - using nalgene/gsi or ??? - to capture the water, steripen (fast, minimal weight) to sterilize, hydration bag to carry the sterilized water. don't mind 6 lbs of water but 12 gets heavy! and some places we go have year-round, even in drought, water.