AKIRO Film Canisters with Caps 35 mm Empty Camera Reel Storage Containers Case Plastic Storage 15 Pack Black

The seal is consistently tight, and this canister works well for lab demonstrations.

These worked great for alka seltzer rockets. My only complaint is that some of the kids wouldn’t snap on.

Very fast and efficient.

I use these for geocache containers. They are durable and seal tightly. They might not be waterproof in a very wet environment, but are perfect for a sheltered area such as a lamp skirt hide. (Geocachers will know what that means.) I think these will be more durable than a pill bottle. I keep a few in my vehicle so I can hide one on a moment's notice or to replace a damaged existing cache. The price is very reasonable.

Haven't used them for what I bought them for yet. I want small well sealing containers for backpacking. They are all plastic unlike some old rubbery ones my mom has. But that is probably to be expected for the price. The lids seem to seal fairly tightly. We'll see if they are tight enough.