On the sidecar it's mounted on a rack designed for a 2 litre fuel bottle, externally on the rear of the body. The actual bag is a plastic washbag I got one christmas, so it doesn't have "free syringes and mind altering drugs" markings, but can easily be got at. The alternative I used to use solo was a similar bag bungeed inside a pannier lid. The idea as mentioned above is to have it where you can get at it without unloading the bike.

The tail light position sounds good, but I guess you're going to check in won't press on the lamp and cause bulbs to fail?

Actually, I think you need two lists. One will be the stuff you hope no one ever has to use on you; the triangular bandage, shell dressing, superglue and so on. The other is the one you probably will need to use: cold remedies, stoppers, goers, hang over cures, cream for trench foot (UK summer ) etc. The first one is only any real use to treat an imeadiate accident, which is equally likley to involve treating yourself having burnt a hand on the exhaust, stabbed yourself with the tin opener or other domestic incident. The other bag you won't need urgently and contains various over the counter drugs whose names might not be common outside the home country. This bag I'm tempted to think is the one people might be after, the one customs men may like and the one that's better under your other gear. Spliting the load also makes the actual external kit smaller and easier to handle.

Andy