It can be in a soft case, does not need to be locked or even a locking case but must be unloaded. Crazy thing is you can have a loaded magazine in the case with it and thats ok, but put the loaded magazine in the weapon and that constitutes uuw in Illinois. Most S/A'w will not charge it but that depends on what county you are in.
You can take it into your motel room, tent . . .
2 situations where you can transport in Illinois are: 1) broken down and in a non firing state
or 2) unloaded and cased it also must not be immediately accessible so under the seat is bad, glove box, behind truck seat or trunk are acceptable ( on bike in saddle bag ). They are out fighting those details now, At one point a off duty LEO could not carry in state park but a hunter could, welcome to Illinois , , ,
http://www.isp.state.il.us/foid/firearmsfaq.cfm