We are proud  to offer a 100%, no questions asked guarantee. If you feel your product was not  satisfactory to your needs, please contact us within 60 days to request a  return and you will receive a full refund upon return to our facility.These bags are very durable!They have a reusable Zip Lock on the top and the bags are bottom filled.These bags also feature anti-static film structure.You need a heat sealer to close the bags!  We recommend theFS-200 Impulse Sealer.