Grip 'n seal technology. Unbeatable freshness. Microwave safe. Made with wind power. Strong enough to use again. A family company since 1886 -Fisk Johnson. See bottom for details. Ziploc bags are reusable after hand-washing and drying! We do not recommend reusing Ziploc bags after storing raw meat, fish, eggs, or potentially allergy triggering foods. Defrost & reheat - Vent bag 1 inch. Compared to other freezer seal top 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.