To be used with bag neck tapes, these sealers provide a quick and easy way to seal poly bags, most notably bread bags. Different colored bag neck tapes can be used to make the product stand out. The bag neck sealers are very easy to use. Simply fill your bag, twist and bundle the top portion (neck) of the bag, and push the bundle through the bag neck sealer, where the tape will form a tight wrap around the neck of the bag.