Where might a child keep their towel for overnight?
Options:
- backpack
- linen closet
- swimming pool
- at hotel
- shelf
Let's think carefully first. Step-by-step reasoning process:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
A child might keep their towel in backpack for overnight. So the final answer is backpack.