Grip'n Seal Technology: Unbeatable freshness. Microwave safe. Strong enough to use again. Fill, use, repeat. A family company since 1886. - Fisk Johnson. Defrost & reheat - Vent bag 1 inch. Bags made with wind power. Environmental Facts: Bags are recyclable when clean and dry at drop-off bins at participating retailers. Please recycle this paperboard carton.