i have a similar experience as others.
started with nalgenes. went to platys. went to gatorades and soda bottles. now i've got my water system to include 1 of each…
1L nalgene, 1L gatorade bottle, 1 2L platy big zip (no hose attached). i use the nalgene (also for hot water bottle) and gatorade to drink from while on the go, but use the platy to fill up when getting to camp, so i have enough water to last me for dinner and breakfast. i've also hit big stretches with no reliable water source in the summer, so i've sometimes needed to start my day off by carrying 4 liters at a time…
other than the inconvience of having to put it in my pack and dig it out to refill, a pain in the ass to clean, i found it tough to regulate how much water i was drinking when i was a full time platy guy. for some reason it's easier for me to know how much i'm drinking when i just gulp from a 1 liter bottle…

