Sterile bag for water sampling – 100, 300, 500, 1000 ml., with thiosulfate

Bags used for collecting samples of drinking water and treated waters of swimming pools, sewage, etc.
These bags tend to stand on their own, they are pre-sterilized, they are unbreakable, compact, with matte band for identification and closure
It is totally waterproof.
They contain 10mg sodium thiosulfate tablets inside for each
100ml of water.