Those vacumn bags are not true vacumn.

If you want almost true vacum (More than 29 inches of mercury column by HVAC standards.), you should attach an refrigerant vacumn pump to it. The bag still would not seal well enough to maintain the vacumn. You could include a dissecant pouch in there, flush it out with CO2, or helium gas before you seal it. The dryer sheet may mask the odor to a certain extent, but I do not believe it will stop the process that gives out a musty odor.

Bountyhunter