Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very convenient add-on to the FoodSaver

Very convenient storage case for a roll of FoodSaver bag material. The front of the case features a sliding cutter, allowing you to neatly cut bags in a straight line. The blade is completely concealed, making it a very safe device children can use.One of the dissatisfied reviewers pointed out that the bag roll is not held inside the case, causing the material to shift as you slide the cutter and resulting in wavy cuts. True, but easy enough to fix: hold the bag while you're sliding the cutter, and you'll get a perfectly straight cut everytime. You don't even have to apply pressure to the cutter as you slide it from side to side, because of the blade's clever design.Highly recommended if you use your FoodSaver often.