Polyethylene flasks
prices on 3 models— most commonly, polyethylene is a soft polymeric material used in flexible flasks (see "Type"). With a small thickness that allows you to compactly fold an empty flask, it can be quite durable and reliable, although such a vessel anyway must be carefully protected from punctures and cuts. However, rigid polyethylene vessels are also produced — they practically do not differ from plastic ones (see the relevant paragraph).
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