This is a microwave bag perfect for sterilizing baby bottles. - Brand: medela - Product Name: Quick Clean Microwave Bags - Purpose: Sterilization of baby bottles Sold as a set of 2 bags. One bag has been used once. The item will be folded compactly for shipping, please understand. Thank you for your consideration. From the official website: ----------------- For sterilizing/disinfecting plastic mother & baby items using a microwave. Can be used to sterilize breast pumps, bottles, pacifiers, cups, etc. 【Ultra-compact and space-saving】 Easy to sterilize with just one bag. Compared to other sterilization products, it doesn't take up much space in the kitchen. 【Easy to carry when going out】 Great for sterilizing when visiting family or traveling. If there's a microwave, you can take just one bag with you. 【Easy and speedy with a microwave】 Sterilization is complete in 3 minutes at 800W, or 5 minutes at 750W or less. You can sterilize immediately when needed. 【Sterilizes 99.9% of bacteria with the power of steam】 Add 60ml of water to the bag and heat it to sterilize with steam. No chemicals are required. 【Can be used up to 100 times】 Each bag can be used repeatedly up to 20 times.