Water tight cylinder container

If they can float then potentially as a float for fishing. Also could store fishing lines and hooks in it before using it as a float.

Hold cheese? Sprinkle on food.

Hold salt? Lots of it?

Hold Fire starter?

Play catch.

Tic Tacs

Thumb tacs – not sure why you would need them, but you could carry many.

Hold vitamins?

If its waterproof, it would work well for carrying Everclear into a restaurant to "boost" the alcohol content of your free ice water without having to buy a drink.

You'd have to be alert, though, in case your waiter wants to refresh your ice water.

I learned this from a Spalding Gray movie…

I snagged a bunch of similar containers for free at a garage sale that once had blood sugar test strips in them. I really liked the lid closure – waterproof but could be flip up or closed with one hand. A bit smaller than a 35mm canister, but really close.

I take an assortment of OTC and prescription pills in it (NOTE: I CAN ID EACH PILL TYPE BY COLOR AND SHAPE).

Aspirin for blood thinning during long air travel.

Advil for 4-6 hour pain relief

Aleve for 12-hour pain relief

Ambien to gaurantee sleep and/or realign to a new time zone or during a redeye flight

Benadryl for sniffles, alergic reaction, anaphylactic shock, back-up sleep aid.

at other times, I've also carried Imodium to slow down diarrhia (for the reverse situation, lots of plants function as laxatives), and predisone for contact dermatitis (poison oak).

I also used one of those containers to take a friend's fiance's ashes to the Colorado River and the Great Wall of China and scattered some of him there.

David, are these good enough for Olive oil and the like?

I'd stick with name-brand Nalgene in a 1-, 2-, or 4-ounce size for nasty liquids. In part because of the pressurization that happends to a container when you ascend. They weren't that solid nor liquid-tight. Or, if you have more then 4 ounces, an 8- or 12-ounce recycled water bottle with screw cap. Thinner sidewalls, so don't poke through it, but the screw caps are fine.