Been using my lap dust collector and found out right away that the small bag was not enough to collect all the dust. 1250 cfm was so much force that it blew some of the dust right back out. Solution--- went to Wal-Mart and purchased a pillow cover made from 100% cotton, fastened it with a bungee cord and walla, now I have enough surface to allow all of the 1250 cfm to escape through the bag. Works real well, a little cool on the legs for winter use but sure collects the dust and power carving diabree.
Whatever your hand finds to do, do it with your might.