A must in every ultralight backpack is some form of first aid. I usually take duct tape (you can use to make a liquid in a 1.5 ounce and 2 3/4 inch high bottle (heavy compared with Bandaids) that you brush on: NEW SKIN LIQUID BANDAGE BOTTLE. In less than a minute the New Skin fluid dries and you’ve got a nice seal that covers the wound and keeps out the dirt. I’ve used it several times on the trail. Mind you, it’s only for minor wounds. The bottle says don’t use on large areas or burns. A bottle will last for several seasons and eliminates wasted paper and plastic associated with Bandaids.
Be light. Be safe. Be one with the pack.