Here's my ditty and first aid bag for an upcoming, 3 day, really light trip:
Contents: (starting top left)
1. Princeton LED light - .4 oz - not as light or bright as the Photon, but I already had it. I had to use a hot pin to make a hole in the bottom for kevlar cord (left over from a project)
2. Firelight mini - .4 oz - sans sparker, use small blade of knife
3. Tinder-Quik tabs (3) - ~.1 oz - when I can't find anything else to catch a spark
4. BodyGlide/duct tape/thread& needle - .4 oz - bodyglide repackaged in chapstip tube for chaffing/blisters. Duct tape is a bit archaic, but has worked for blisters. Needle and thread are under plastic wrap under duct tape. This prevents it from getting gummed-up with adhesive. I would have to unwrap the tape to reach them, but I rarely need to.
5. Toothbrush - .2 oz - this is the same brush that Roman posted above, but I've done some cutting. I cut off part of the handle, and then cut 3/4 of the way around the cover, right below the head. I left the 4th side long enough to tuck up against the handle, which locks the cover in place.
6. Dr. Bronner's in dropper - .5 oz - for washing up/brushing teeth. It doesn't taste very good and goes against what I wrote earlier in this thread about fluoride. Replacing 2/3 items with one was just too appealing. I'd probably take proper toothpaste or dots on longer trips.
7. Swiss Army knife - .9 oz - just two blades; I don't think they even make this anymore. Smaller blade is used with flint, larger is good for shaving tinder. There are lighter options, but I've had it forever and it's a sentimental favorite.
8. Whistle - .1 oz - cut from a Whistleloc buckle. I wouldn't otherwise need this kind of buckle, so I just went at it with a hot X-acto knife. Really light and only $.65!
9. REI thermometer/compass - .4 oz - thermometer is good for assessing gear at different temps. Compass is small, but most of my hiking is on a trail of some kind.
10. Ibuprofen (18, 6/day) - .1 oz - apparently I'm a drug addict, but this is the only medicine I ever find myself using and sure helps at the beginning and end of a long day.
11. 3 std band-aids, 3 butterfly closures - ~.1 oz- enough to replace if needed, but not overkill.
12. 5x4 Aloksak - ~.1 - keeps everything dry.
Total= 3.9 oz - so apparently there's an extra .1 oz somewhere in there, but my scale isn't very precise, this especially shows on light items.
*No bug or sun dope - I mostly hike in shade and have long sleeves and a hat for sun. Bugs aren't much of problem yet, and I treat my clothes with permethrin.
*No water treatment - I'm trying nonconventional water treatment like boiling or using a filter straw, which wouldn't be in the bag. Normally, I use chlorine dioxide tablets.