The zipped 'door' is too small to use for changing plants or removing frass (caterpillar droppings). So I actually started using it upside down because it's easier to leave the "top" open and lay it over the milkweed. That way, if we need to change the milkweed, put in a new butterfly, or clean the flour, I can just pick up and remove the "cage" without breaking a single chrysalis, and put it back in without too much trouble. We used to have a big rectangular one that had one side open, which was easier to use because we didn't have to bother it as much. But if you turn it upside down and gently raise and lower it works fine.
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