Double bag with Ziploc freezer bags, the kind with the double zipper and the heavy duty plastic. Never had much problem doing this, though I usually use a vacuum sealer. For added protection, you may also want to put a couple of paper towels between the bags to soak up any juices that leak out of the inner bag. If you're still concerned, make sure they're not getting pinched between stuff and maybe even wrap them in some bubble wrap.
Do NOT get the resealable bags with the little plastic slider thingy - they leak.
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse