Flexible flasks

Flexible flask

— flasks made of a soft polymeric material such as polyethylene or polyurethane. Such containers are somewhat less durable and reliable than hard ones; punctures or cuts can be fatal for them. On the other hand, such models also have noticeable advantages: for example, the volume occupied by a vessel depends on the amount of liquid in it and decreases as the contents are consumed, and an empty flask is very compact. In addition, you can drink from a soft flask by holding it in any position, even with the lid up — just squeeze the walls and draw in the liquid.