My personal favorite are these extra large zip lock bags that I use to put sandy clothes in at the end of the trip before re-packing my suitcase

Amazon Link

I also always bring:

Disposable masks

Ibuprofen

Ear plugs

Extra pair of sunglasses

https://www.amazon.com/Ziploc-Big-Bags-Large-Count/dp/B003U6A3C6

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This? Won't ship INTL either.