Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not happy

I bought my Back Pac Shop Vac for my business because of drywall dust being a problem. This filter does not go to the shop vac back pack and I thought I had the wrong product till I ordered more. If this can be used I am sure it is fine for the shop vac but for the back pac its not because the hole is too small for the entrance of the hose where it is supposed to mount. I am going to call Shop Vac and see if they can send me the right ones. Not happy.....:(