Check bottle stopper to see if it fits snugly inside bottle. If it is loose, air may enter and prevent it from vacuuming properly. Examine neck of bottle and tip of accessory hose for food materials. Any gaps can prevent bottle from vacuuming properly. Make sure the accessory hose is securely in the accessory port on the appliance and on the bottle stopper. Note: For all accessories, make sure accessory hose is completely inserted into appliance and lid of accessory. Twist gray tab on the accessory hose while inserting to ensure a tight fit.