I have used my vacuum saver successfully by using rolled bags and making them long enough that I can actually stand the bag up or place it lower than the unit. Initially I squezze most of the air out of the bag then run the unit on dry vacuum. I have a overflow trough in my unit that catches anything that gets into the unit, but I have not really experienced a problem to this point.
I just sealed up several bags of various sizes and it did a really nice job. Granted, you use up large amounts of the roll, but if you are careful, the bags can be re-sealed as you remove some of the DME.
The unit is really great for crushed or uncrushed grain storage and hops too.