Instruct: Classify Amazon reviews into positive or negative sentiment
Query: WORTHLESS

This product does not work. Keeping the seal area clean doesn't allow vacuum to hold for more than 1 hour. Discussions w/ Tilia reveal heating (w/ warm water) is a possible solution. Of course, with the small mass, the seal doesn't stay "warm" long enough to work... so their suggestion isn't workable. It's a real PIA when picking up a canister (w/ a bad seal) and drop it, spilling 2 qts. of bread crumbs everywhere. Oddly enough, the large (2.5 qt. and up) sizes work fine.