If you're heading out of the city, especially in developing countries, you'll need to take an emergency kit with you. This first aid kit checklist will help you fashion your own first aid kit, but exactly what you put into it will depend on where you're going - not just what country or continent, but what type of geography you plan to encounter.
Will you be sticking to cities or main roads, where pharmacies are widely available?
Will you be in poor or war-torn countries, where pharmaceuticals are in short supply?
Are you heading out into the wild, perhaps the Amazon or the Sahara, where you'll be fully responsible for your own health? You won't need the same in Paris as you will in the Congo.
The first aid kit checklist above contains what I might take with me when I travel for over a month, on my own, off the beaten path but not on what I would consider expedition or high adventure travel. It has worked for me for years and I've (fortunately) never needed anything more.
However, if you plan on really roughing it and being on your own in inhospitable regions for any length of time, please have a look at Equipped to Survive, one of the best sites around if you're serious about survival. As a woman traveling on her own, the information it provides is more than relevant - it can save your life.
You can buy most of what I've listed on the above first aid kit checklist in a ready-made box or package, but I find that putting together my own makes more sense for me.
The first thing is to find a transparent case of sorts. Often, these are provided free as samples when we buy certain brands of cosmetics. Just make sure it has a zipper that works. Better yet, one of those waterproof plastic packets used by boaters will guarantee the safety of your first aid kit under most circumstances.
If you don't have any of these at hand, you can use a nylon bag, or a fanny pack first aid kit.
Separate your items so that they make sense - bandages and cotton together, condoms with tampons and so on. Place each group of items in a simple ziplock bag - these will come in handy while you travel as well.
Do a last check of your medicine cabinet at home. Whatever you stock at home will give you an indication of what you need to take with you. Just because it isn't included in my first aid kit checklist doesn't mean you shouldn't take it with you!
A final word - make sure you check the expiration dates on your medication, especially if you are traveling for more than several months.
I've left plenty of things off this first aid kit checklist but then, I travel light. If you want to bring more (and you can carry it), go right ahead. Just don't bring less!