I have a couple of very compact kits, one of which is basically walking/hiking first aid (e.g. blister stuff) and the other is the sort of stuff you mention. It

I have a couple of very compact kits, one of which is basically walking/hiking first aid (e.g. blister stuff) and the other is the sort of stuff you mention. It's a really good idea to throw something like these in your bag which weigh nothing, take up no space, and can really be nice if you need them. PSA: The small index card holders (i.e. about an inch deep) are really good for these kind of kits as they provide some protection.