Features: *Sturdy and Secure: Designed with side gussets for added strength and durability these bags create a sturdy stand-up bag that can hold up to 5 lbs and has a secure bottom seal. * Excellent Breathability: Each bag features a premium 0.2 ventilation patch that allows gas to flow freely making your mushrooms 99.99% breathable and helping them grow better and breathe better. *Save Space: With a size of 6 x 20 /12 x 20 these bags provide enough space for mushrooms to grow while significantly reducing the space required to grow or produce mushrooms compared to trays and buckets. *Wide Applications: Suitable for mushrooms bamboo fungus reishi mushrooms substrates grains and more these bags are perfect for indoor gardening grow tents or greenhouses farms school lab projects and daily family hobbies. Specification : Color: as shown Material:PE size: 6 x 20 12 x 20 Package Contents: 30pcs Mushroom Growth Bag: length 50cm width 15cm (a set of 30pcs bags + 32pcs stickers) or 15pcs Mushroom Growth Bag: length 50cm width 30cm (a set of 15pcs bags + 15pcs stickers) Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.