CynKen 10pcs 50ml Plastic Centrifuge Test Tube Empty Bottles Self Standing Screw Caps

These are a perfect fit into my travel toolbox. Great size for collecting samples to view under my microscope. Tested the waterproof-ness of the lids: just as advertised, no leak even when kept lying sideways for an hour or being shaken with liquid inside. Easy to clean, and it's great that no tube rack is required because they stand on their own. Very happy with purchase.

Exactly what I needed.

I used these to organize my gun cleaning accessories per caliber. Sturdy, well made.

I like the design and the fact that it stands. The only problem is they have the potential to leak with hot liquids. Otherwise not a bad product.

I use these in my survival staff

Product was as described but it arrived missing 2 caps.

I use this centrifuge bottle to hold my gun oils. I got tired of my oils leaking in my bag, so this has been a good alternative so far. No leaks.Edit update: My wife has absconded with four of my bottles to hold her vinegar and oil and other dressings in her lunch box; she’s a flight attendant.

The tubes seem ok. One showed up with marking scratched and residual liquid inside. Looks used. I'll likely buy from a different company next time.