I saw (and bought) a different vacuum system on QVC called the Frisper and it intrigued me because the bags are ZIP-LOCKED at the top, so it's easy to get just part of the contents out. The bags come in two sizes and they're very similar to FoodSaver.bags in thickness.
I've used FoodSaver for a decade and this looks a lot more practical. You take out only what you want from the bag, zip up the top, then reseal the bag by means of holes along each side. The machine is a flat oval shape easy to fit on one hand, and to reseal you pierce a hole, air is sucked out, and the circle around it is heat-sealed shut (5 circles each side of bag, 10 uses for each bag).
I don't have anything to vacuum seal at the moment, so I will just give you the link to see for yourselves:
San Diego, CA
Judy in San Diego