Indian River Lagoon

This started out as a Plein Air Painting.  I made modifications to it in the studio as I realized I had not provided a center of interest.  For some reason I get so enraptured with the beauty of nature and trying to capture it all, I lose what I want to say.  I am thinking of lightening my plein air equipment,  Has anyone had success with something small that is easy to fill and store and not too expensive?