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It was not compatible with my Sodastream device.
Nothing related is mentioned in the specifications.
All the instructions are in Czech.
The nozzle is different and seems to have some kind of thread.
Also, the ring that lifts and holds the bottle during application is missing.

Useful and affordable package, especially with the children's toys that always need to work. Immediately.
Very convenient that they are packaged in sets of four.

I have had it for about a year and I use it every week. I transfer refrigerated food that I want to keep for 8 hours until they go back into an electric refrigerator. Although it is quite bulky, its build quality is very good and its carrying handle is durable. The rubber clasps it has are user-friendly, although sometimes when you carry it, they touch your leg and open. As for whether it maintains temperature, I would say yes, if you put in 3 ice packs and products with an initial temperature of 5 degrees. Then it will keep them for 7-8 hours

I have had it for about a year and I use it occasionally. Nothing special. It doesn't break and it doesn't change shape much when frozen.
It's good for blocks, but I think it's expensive for what it offers.

I use it very often and it has no durability issues. Inside a portable fridge, it can freeze a 500ml bottle in 2-3 hours. If you just want to maintain the temperature inside a portable fridge, it should not touch the products inside because it will create ice on them.