Hint: Containers
The answer to this puzzle is:
1. JAR
2. HANDBAG
3. CUP
4. FOLDER
5. GOBLET
6. VAULT
7. TRUNK
8. WALLET
9. SAFE
10. POCKET
11. CANTEEN
12. BASKET
2. HANDBAG
3. CUP
4. FOLDER
5. GOBLET
6. VAULT
7. TRUNK
8. WALLET
9. SAFE
10. POCKET
11. CANTEEN
12. BASKET