What to look for in bicycle travel cases
Make sure it is sized to your bicycle.  The one time I flew a commercial airline with my bicycle I planned to use my father's travel case.  But with the wheels, cranks, seatpost and handle bar/stem totally removed my frame would not fit.  (A 64cm road frame).

Because it was for a one time, one way trip I got some shipping boxes from my local bike shop.  I got creative with the foam and packing tape.  Bike made the trip just fine :)