The standard model (Sport) is 30.5" in length (collapsed) and 33.8" fully extended. I'd go soft case / bag as opposed to a hard case. Prices are all over the place as are shapes, padding, etc.
Though I got them from a locally owned store, I have a few of these and they work just fine.
https://www.walmart.com/ip/Allen-38i...97&athena=true