There are many enclosures you can choose for your butterflies. I like the mesh enclosures because, if for some reason your chrysalis falls, when the monarch emerges, they can just climb up the side of the enclosure. This is vital for proper wing expansion. You can buy a commercial Butterfly Pavilion from Insect Lore OR you can purchase a regular laundry hamper with a zipper. Commercial pavilion does have finer mesh for better viewing. Below are pictures and links for purchase.