JOVITEC 30 x 35mm White Plastic Film Cans with Lids for Storing Small Accessories, Camera Rolls, Keys, Coins, Faux Pearls

We used them to show chemical reactions by launching them into the air. They worked great! Great seal and the plastic moved enough to cause it to shoot about 25 feet into the air! Will probably be buying again next year.

Good for airtight storage.

I purchased these after I saw another math teacher using them to sort her supplies. These are perfect for holding double-sided counters and now I have a class set already organized when I want to pass them out.

I teach a summer science class and have been using these clear Fuji film style film capsules for my Alka-seltzer rocket activity. These have worked great. The elementary students do sometimes have trouble removing the lids. However, you can't use the old style film capsules where the lid goes over the top. You need these kind where the lid sinks into the capsule and sits flush.The lids do have grooves around the side similar to a quarter, which does provide some grip to remove it. So far, these capsules have worked great and provided a nice seal with which to conduct the experiment:1/4 Alka-seltzer tablet1/3 water (allowing room for the tablet to dissolve and create air pressure)Flip it over with the lid down and stand back for it to launch. You'll sometimes still see some tablet residue as it may not fully dissolve before the air pressure causes the lid to pop--sending it flying up to 20-30ft high. :)

Purchased June 2020 Sold by: Jovitec UsThese worked great for film canister rockets with alka-seltzer tablets. We did not use the full 30 but maybe 15 of them. Only one of the 15 lids didn't have that great of a seal. The price point was great. Helped to keep this event activity very low cost!