Put together your own kit - buy a box that will store easily and will hold what you need to put in it. To fill it start by looking at what you use at home and duplicate that first for your first aid kit. Then think of things that could happen while away that would not likely happen at home and decide what you need to for that. Most outdoor stores sell packs that will stop/control bleeding from significant wounds and if it is possible that you might be in a situation like that these packs are worth including - though not cheap. Then also add basic over the counter medications for common problems (and mark the expiration date for each).