This is a neat idea if you have a 3 piece picnic table. stack the benches, add some boards to the sides and you have a nice potting bench.
This old house has over 20 smart home solutions like this all together in a slide show. I like the benches acting as shelves on the potting bench a lot.
Turn a Picnic Table into a Potting Bench
2x4basics 90164 Workbench and Shelving Storage System
Potting Bench: Downloadable Woodworking Plan
Suncast DCP2000 Prep Station
Cedar Potting Bench with Soil Box
This Old House (1-year)