besides using the vacuum sealer (foodsaver) to seal the mylar, couldn't you also use a curling iron or clothes iron (set on the wool setting)? Doing a quick google search for - - using an iron to seal mylar - - brings up some videos and sites that talk about this.
As for the zipper top mylar bags, Hopefully they'll stay more secure than the zipper tops that are found on plastic sandwich/freezer bags. If using them with O2 absorbers and plastic buckets, maybe they would hold up ok?
"To show you how radical I am, I want carjackers dead. I want rapists dead. I want burglars dead. I want child molesters dead. I want the bad guys dead. No court case. No parole. No early release. I want 'em dead. Get a gun and when they attack you, shoot 'em."
Ted Nugent - speaking at the NRA convention April 17, 2005