I think for evacuation, a soft bag would be fine. They'd take up less storage room. My larger bag can be folded over to store, but my smaller one is a bit sturdier material.
By the way, thank you for always spelling Fionna's name correctly. The name usually has one "n"and that's how the zoo spell's the baby hippo's name. I have always used 2. Same thing w/ Juliette. Many spell it w/ one "t."
Love All Life, Thank You For Posting! :)