> > Bill, do you think that several ziplocked bags (one inside the other) would
> > be equivalent?

Probably. Just get the air out as much as possible.
The reason I use Saran is from a Consumer Reports test that
showed it was almost impermeable to air while all the other wraps
were to some extent. There was a great ad a while back that had
meat wrapped in Saran and in another brand. A tiger sniffed at
both and tore up the other brand. End of commercial endorsement.
Main thing is to keep the Apistan away from air, heat and light,
the big three contributors to reduced efficacy.
Bill T
Bath, ME