Yikes, that sounds like it was a very close call!King snakes are escape artists, & given a few hours, would likely find their way out of the bottom flaps of the bag. They have nothing better to do, so they're very persistent. Also, a bag or any container with a little snake in would have just enough sound or movement that your cats might "help" with her escape...
so they're always safer locked in the main tank.
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I've had many years of practice -learning the hard way.I once had an adult bull snake escape from a "very secure side container" when I got too sleepy to finish cleaning her cage one night. She turned up SIX MONTHS later, after hibernating from mid-November to mid-May in an inaccessible space under a kitchen cupboard...happily she was fine & lived happily ever after...but she gave me a LOT of guilt & anxious but hopeless searching until then.