I'd recommend a cheap plastic tournament set. You could either purchase a bag designed for chess pieces or simply use any old bag you have lying around (e.g., a grocery bag). USCF Sales's website can easily hook you up. The standard plastic set is currently (as of 2023-8-12) listed for $8.95. A drawstring chess bag is available for $5.95.
Recommendations for public stone tables?

Chess Sets for Club & Tournament Play...
https://www.chess.com/blog/RussBell/chess-sets-for-club-tournament-play
https://www.chess.com/blog/RussBell

Sitting on a stone or marble block/stool for a long while can be uncomfortable. Therefore, pack a beach towel or a pillow. This can especially be the case in cooler weather.
Lastly, it’s always nice to BYOBeverage; hot or cold. So, remember your thermos.
Have fun!
Hey everyone, I'm curious what people recommend for going to a public chess area with stone tables? I figure a clock and pieces but what pieces do people recommend? How do you transport them?