Securing a Rubbermaid Bin for Baby Corn?

[Morel]

Hi I just got a young corn snake a few weeks ago (about 14 inches long) and I've been housing her a in a Rubbermaid bin. She was fine in there till about a week ago and then started getting out. I've realized that the gap between the lid and the bin is just barely big enough for her to squeeze through. After the first time she got out I wrapped tape around the lid to block off the gaps...haven't had a snake before so didn't realize the poor thing would get super tangled in the tape. Now I'm not sure what to do. I know I should just buy her a more secure enclosure but I'm hoping someone might have some ideas for ways to block the gap so I don't have to buy a new cage? I thought of maybe making some sort of thing like a draft stopper for doors, but make it rectangular to fit the bin? Any ideas would be great!
Thanks