The first bags I had from them didn't do that I even reused em a few times but recently the quality of that zipper has been kinda bad even on the mephisto grove bags.Hmmmmmm. Haven't had those issues, but haven't ordered in awhile. Bought a shitload at the start of the year.
it'z becuz the sealz are....U GUESSED -> entropically unstable ................................jus sayin 
ppp
dare i say it-?
Godamn entropy.dare i say it-?
Was up an hour ago checking the storm, damn protector mode has switched on and gonna be a rough couple days trying to get sleep. Wife buying into the fear hype and bugging so I gotta break out the generator...."JUST IN CASE" Funny how wife's can just put stuff off and decide they don't really need it if it's their asses having to do the work but have no problem expending our energy on so many maybe's.
Morning Kittens.
... UK newspapers are sounding ominous about the size of it..
ppp
I must have come to the right place then....... 
