a pigskin suitcase的用法和样例：
- Do you want to watch a pigskin game with me next week?
- It is a large leather suitcase with my name tag. It's dark blue.
- We've got a spare suitcase but it's not very get-at-able.
- There is a vein of melancholy in his character.
- There was a long lag in forwarding mail to us.