In a pinch, a vacuum cleaner bag is actually reusable. The bottom end of the bag is usually folded over a few times and glued shut.
How to Reuse Your Vacuum Cleaner Bags (Yes, It’s Possible!)
Do This If You Are in a Cleaning Pinch
“In a pinch, a vacuum cleaner bag is actually reusable. The bottom end of the bag is usually folded over a few times and glued shut. To reuse a bag, unroll its end, being careful not to tear it, and then empty the contents into the trash. Refold the end and staple it back together. This hint definitely deserves a cheapskate award, but it works when you need it to.” — Travis Larson
To be safe check out these 13 Things You Should Never, Ever Vacuum