Overwrap Bag in Bag
Overwrap Machine is the Bag-in-Bag or Hotel Pack Machine
The overwrap bag in bag Inner pouch is a filter bag and the outer one is metalized or some sort of Mylar. Special about this machine (or two machines stacked on top of one another) is that it can do a square bag with all 4 sides sealed making a round "free area" in the middle.
The Best of Both Worlds
Now, you have the best of both worlds with a free corner to pick up the wet bag and throw it away and you have a clear center that gets 100% of the water. This is far better than the fin seal running down the middle of an oblong bag and you trying to get it in the center sith coffee filled corners fighting you all the way. Gee, all I want is to get my coffee brewed and rapidly as I need it . . . now. Lots of configuration possibilities. Price below is average price INCLUDING a proper augar filler which is not pictured, auto fill indicators, photo eye, belt drives, and able to run from 3" wide to 14" wide on the same machine. This is as idiot proof as you can get on a form/fill/seal.