50ml Plastic Centrifuge Tubes with Screw Cap, CertBuy 50 Pack Self-Standing Plastic 50ml Test Tube Polypropylene Conical Tubes with Cap, Graduated Marks

Outstanding little bottle. We use them for small machine screws and things like that. They hold up well.

I am using these in a rather strange way. So I have a bunch of disposable ice gel packs that came with my medication. I didn't want to throw them away and reusing them wasn't idea since they ripped so easily. I wanted to reuse them. I wanted something small and durable that wouldn't break as easily to fill with ice gel. I tested out 20 vials and put them in my cooler and so far so good. Unlike typical ice gel packs, these are small and fill up crevices of my cooler pretty well.

Great cost effective way to store coffee beans. I have used the for a few months now without any negative issues. Stores between 15-18g of beans depending on the bean. I have airtight canister and fill it with pre measured doses so I can just grind and make without lots of measuring.

Pressure Cookable up to 300 degrees f.

Their all sterile I have no issues with my mycology work.

These were purchased for biological testing that involved odors. I guess I am used to them coming packed in something besides a dirty ripped ziplock, and usually in foam racks. My problem is that they have evident plastic phalate off-gassing and smell, which makes them useless for my intended purpose. Yes they are polypropylene, but either the tubes or caps are made of excessively cheap material. I would give them 1 star if they were purchased from a laboratory supply company. However, they are probably fine for anything non-laboratory related.

5 star means, it is exactly what I expected. If people are looking for something they might (I do) use the "average customer review" display option, and I try to stay in the "most 4 and 5 range," so I wouldn't rate something lower unless there is something wrong with it. I use these, mounted in a larger container and with the tops cut off (usually) as a place to put screwdrivers, files, wrenches, drill bits, etc. Saves having to make a rack with holes in it. I would have preferred tubes without the conical bottom but could not find ones that were short enough and wide enough in any other style. If you want this size, these will work if you aren't average to conical bottoms, or you could leave the top on, saw off the conical bottom, and use them upside down.

perfect size. I am using for yeast storage in homebrew. 25ml of yeast slurry with 25ml of cryopreserve. The flat bottom makes it very easy to use, no need for a tray to hold upright. these are heavy duty. great value for the money.they seal well and do not leak