I have a solution to Pastels on the Beach!  George found a perfectly sized waterproof bag that doubles as a backpack.  

Very lightweight, and holds everything except my paper and support board.

We packed it up and headed to the Exuma water park, where we set up opposite Johnny Depps' island.  What a view!

 I had my easel up and was just blocking in the underpainting.

Suddenly a huge body guard came flying up in his boat and ordered us off the island! (I'm not even in a tv series and I'm kicked off the island?)  

I'm working on the painting in my studio now... maybe I'll just send it to Mr. Depp?