I agree with Phaedrus on that bag. I use these in my kits, and I have some of the aqua pouch plus kits. They are small, fit in a pocket easily and can get you through for a while.

Those 1qt bags are nice. Breast milk bags work better than condoms IMO and they're fairly durable.

One of the useful things about condoms is that they can be used for waterproofing small items. And they have a larger opening than a balloon for loading things.

Put in some lifeboat matches and a striker and tie off the end, or a Bic lighter, or a collection of PJ/cotton balls (probably best to use silicone condoms for that).

Yes, we are talking about non-lubricated condoms.