Yes, vacuum sealing bags can be reused. However, it largely depends on the bag’s previous contents. Bags that contained pieces of bread, dry goods, vegetables, fruits, and several desserts previously can be washed and then reused. But bags that previously contained fish, eggs, unpasteurized cheese, or raw meats should be thrown away after usage as they may contain unseen bacteria that’ll persist even after washing. Also, bags that previously contained oily or greasy foods should be thrown away because cleaning them may be difficult.