Flix, the foodsaver bag is a good idea because they are super sturdy, how do you close it?
And the 'biner just got left on there from the cocoons last use as a hygene kit
I'm picking up some of this:
http://www.uline.com/Browse_Listing_3110.asp?pricode=wf725 in one of the flourescent colors, and you've got yourself a nice setup too
Here is how I made mine so it would close. I cut it and reasealed the bag so it had just a small funnel to it. I can fold it over a couple times, and tie it close with some string. Once it is tied, the string won't slide up and off because top flares out when the string is pulled tight.
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The red line is where I seal the bag. I usually seal it twice to make sure. Also, the bag would not fit in my sealer on the very edge because of the "U" shaped hooks on the lid for holding down the top part of the sealer. I just took them off as it is just two phillips holding them on.
It may take you a bag or two to figure out where you need to be with the sealer so both red lines cross and seal without going to far or not enough, but once you know where you are, it makes a great little water bag.
I roll my bags up with a sheet of paper, and then a small piece of tape holds it nice and compact.
I also carry some tin foil. I roll it up to. Folding it has ALWAYS made small holes in it and it never holds water. Even rolling it will create small holes and leak out water. I use the foil as a double boiler and whatever amount of water the foil holds is enough so I can put my FOOD SAVER BAG in it while it is filled with water and boil it. That small amount of water keeps your bag from melting, but you are still able to boil your water right in the bag.
I also tie a small piece of string to the top of the bag and to something over head like a branch to keep the bag from tipping over. Not tight or anything, but enough to hold the bag up right.
Those bags are made to be put in boiling water. So this works pretty good with a little practice.
I would also take an old water purification tablet bottle, and fill it with bug juice then seal it with wax. That will really make an unexpected over night stay easier. I also use the small MRE Tabasco Sauce bottles for small pocket kits like the ALTOIDS tins. Both of those hold more than enough bug juice to make it easy to sleep for a night or maybe two if you just do your hands, arms, face, and neck.