I happen to have several of the white plastic spools that 2-1/4" cash register paper comes on. They're only about 3/4" diameter. I take a roll of duck tape and roll several feet onto that little spool; since the duck tape is 2" wide, that leaves about an 1/8" of spool on each end. I carry that roll along on hikes because it fits easily in a pocket, unlike the regular roll of duck tape which is bulky and cumbersome to carry.

Freezer pint baggies, sandwich baggies, pill baggies w/folded strips of paper for temp logbooks, 3 folded paper towels, all inside a quart freezer baggie that stays flat in my backpack. I don't carry or replace l n l's. Based on responses here, though, I plan to add a strip of duct tape wrapped around a pencil or flat piece of plastic. That's a great idea for repairs. Someone else mentioned a toothbrush to clean out gasket seals on the l n l's, so I'm considering that, too.

I do carry 2 different sizes of LnL containers with me, but actually rarely decide to use them.

You may find yourself inspired by a great box, though. You follow some clues that surprise you with how clever they are and find yourself in a little-known slice of heaven and are already blown away before you reach into the hidey hole -- and pull out a squirrel-chewed container with several gaping holes. That's perhaps how it should be; the so-so boxes are allowed to deteriorate into oblivion while the truly outstanding boxes get maintained by everyone involved.

Thank you Kirbert for presenting a positive approach to this thread. It is refreshing to read in a constructive light.
The other thing in my kit, that I have not seen mentioned, is stamp cleaner. I dab on some cleaner then pat the stamp on a folded paper towel. This is for stamps that have ink built up on them.

I take duck tape and wrap it around a popsicle stick. You can do two colours on a stick and it's a lot lighter and less bulky than the roll of duck tape. I carry it mostly to make small repairs on a cracked box or pouch.

I take duck tape and wrap it around a popsicle stick. You can do two colours on a stick and it's a lot lighter and less bulky

....I had been thinking the same basic thing.......

Except I don't even use the popsicle stick....I just start with a 1/16th inch fold-over onto itself.