casecover
nounUK /ˈkeɪsˌkʌvə/
US /ˈkeɪsˌkʌvər/
A casecover is a cover that goes on a case to keep it safe.
She put a casecover on her phone case so it would not get scratched.
OTHER MEANINGS
2. A removable fabric or plastic cover fitted over a suitcase or travel case.
He zipped the casecover over his suitcase before the flight.
3. A decorative outer cover for a book or document case.
The old map was kept in a leather casecover.
4. A protective lid or sleeve for an instrument or equipment case.
The guitar casecover kept the dust off the case in the garage.