If you’re into raising Monarch butterflies, at some point you will need an enclosure that is big enough to hold them when they eclose or come out of their chrysalis.
Below is an option that I just found at Costco. You get two mesh laundry begs for $11.99. They are just the right size to hold several Monarchs before you release them.
If the chrysalis is on a leaf you can attach the leaf to the side of the bag with a safety pin and not damage anything.
Note – there is a small hole at the top and you could cover that with a piece of fabric. The fabric is good for holding Monarchs, but not fine enough to keep out tiny wasps if you are raising caterpillars.