Actually not true, unless something has changed in the last few months with the materials DSS uses..
Oxycheq, the last time I checked, has the thickest bladder material available (24 or 25 oz) along with the toughest exterior cover in their "Extreme" series wings which is made out of the same material that they use to make puncture resistant gloves for hypodermic needle safe handling.
The extreme series material is extremely difficult to cut or poke through.
...since you brought it up.
Thanks! In my quest for knowledge, I compared 5 manufacturers but did not validate Oxycheq. What I did find is manufacturers use a combination materials for outer and inner and some are heavy/light, heavy/heavy, light/heavy.
Dwayne
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