Cue Cases come in many different designs, come will have a couple of pockets on them so you can store your chalk and tip rounders, or whatever you want to store there. Some cue cases are made of leather, some fancy pool players might have a cue case made out of animal skin, some will just be made out of a cheap leather rip off material.
Cue cases are designed mostly for the two piece cue stick, the inside of a nice cue stick will usually be made of a soft type fur material to protect the wood structure of the cue, also protecting the cue from nicks and scratches when transporting the cue. So depending on how much you care about your pool cue will decide how much you are going to spend on a cue case.If you have a 1000 dollar cue stick you better invest in a good cue case for it, it would be foolish not to.