The ITS bottle holder is 2.7 oz and $25.00. I have found the MOLLE canteen pouches for as little as $3.00 each on fleabay, average seems to be $5-7, call them $10.00 each eith shipping. I picked two up locally for $5 each. This afternoon I weighed my intact Molle pouch at 5.75 oz. Then I chopped off the top flap, the Y-strap, and the PALS webbing. I pulled off the lower fastex point. The shock cord is now used to secure the bottle in the pouch. Tac ties are used for attaching it, and are included final weights. It works great with the nalgene, so I went out and bought a gatorade. The pouch fit is really sloppy, so I added a 8 inch loop of shock cord to hold the gatorade bottle in place. Weight came down to 4 oz without the extra shock cord and cord lock, and 4.25 oz with. Total 1.5 oz in weight savings.
I am not too impressed. I like the flap; one of my canteen pouches holds a medium KU pullout with my butchering kit, and fire kit, with enough room to add a couple of survival necessities. I have so say that the weight savings is not worth the loss of utility. My newly butchered pouch will ride on my EMR belt with my nalgene in it for training hikes. My multicam MOLLE pouches will be un-modded come hunting season, and I will lose more weight by using gatorade bottles than by trimming the pouch. I need to start looking earlier and save them for the trip.
I read on other forums that cross threading a lid will damage the threads enough to get leakage. My kids have water bottle fetishes. They each have their own, but lose them in the house and car, and wind up using old gatorade bottles, old water bottles, ect as much as they use their bottles. That may have been the source of my problem...
pat