Just picked up a couple of the below for our trip coming up. Quality seems very nice. No personal experience in a park yet but there are a lot of pretty solid reviews, and the price point is great. It reminds me of the LL Bean Day Pack for about a quarter of their price.

https://www.amazon.com/HIKPRO-20L-Lightweight-Packable-Resistant/dp/B07C8JGN6M