tight-fitting case
nounUK /ˌtaɪt ˈfɪtɪŋ keɪs/
US /ˌtaɪt ˈfɪtɪŋ keɪs/
A case that fits something very closely and snugly.
She put her glasses in a tight-fitting case so they wouldn't get scratched.
OTHER MEANINGS
2. A protective container made to hug an object's exact shape.
The phone's tight-fitting case kept dust out of the ports.
3. A small box or sheath that holds something firmly in place.
He slid the violin bow into its tight-fitting case.
4. A covering that stays on securely without slipping.
The tight-fitting case on the tablet never came loose in her bag.