I note this 'freezer bag' securing system is having some serious issues with trousers and jackets popping open when they shouldn't. Makes you wonder how the gear would cope with sliding down the road?
OEM answer: Lubricate the closure. Yeah, I really have to do that with all of my robust zips eh?!
Imagine if your high end suits all had these fitted as a matter of course! That's almost like investing in Betamax innit!
Buy one? Not on your life - which it very well could be judging by various forum feedback...