Blueberry ~~ Bubble wrap! We used it extensively when we lived in Belize as we had only bicycles for transportation and rode on various bumpy unpaved roads, sandy paths, and cobblestones. With ripe tomatoes, wrap each one individually. You can wrap a towel, cloth bag, or larger piece of bubble wrap around the whole group of them, but individually wrap 'em for sure. You wouldn't believe all the stuff we have managed to get home safely with bubble wrap. Yes, there is the occasional "oopsie", but it's rare.
Good luck!
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow