I saw this idea on FB this week and we tried it.
In a one-quart mason jar, add dressing first. Then add anything you like - peppers, cucumbers, radishes, mushroms, cranberries, sunflower seeds, cheese shreds, etc. Lastly, not touching the dressing, add lettuce and/or spinach. Store in fridge upright.
To serve, dump onto a plate. It ends up in the right order - lettuce, stuff and dressing on top! Awesome, and I can prepare it at home before we leave or several at a time on the road.
2014 Thor Motor Coach ACE 30.1 (The Mothership)
2013 Honda CR-V (The Pod)