Fantastic! These bags make the dreaded task of removing blasted fiberglass insulation that much easier! I used them with a dust collector (Shop Fox W1826) hooked between two 4" hoses to pick up pink dirt. The opening size of the bags is designed to fit a much larger hose but can be wrapped around a smaller hose and secured with clamps. I hung the end of the hose from the ceiling and filled the bags from above. Even filled bags had an acceptable weight for only one person. I could move them, roll them onto a trailer and throw them. Landfill without much difficulty.