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What may seem like a pretty self explanatory and simple idea may really blow you away. The reason it is important to understand the IFAK or individual first aid kit, is because you can find a variety of these on the market. You have to understand the contents of a good kit in order to even begin shopping. Now there are redundancies out there that make sense. If you have a solid kit you could buy a cheaper kit to have for backup. Still, you are facing the problem of having questionable adhesive on bandages and things like that.
Once you have isolated the important parts of a kit that need your attention you can begin to seek out the very best option for your needs. I would almost recommend building your own kit from scratch to assure you get everything for your personal situation.