I use a small truck to shop at stores. In the past all the packages used to tip over and roll out of reach. I got some short bungie cords and gathered all plastic bag handles to the loop near the tailgate. No more crawling around the truck bed
Another idea: get a large cardboard box, 'topless', and pile all your bags into it. If you get lots of stuff, use more boxes. My truck has a covered bed; if yours is open, you might want to consider boxes w/ all its' sides so it can be closed. One box, in which are stuffed all my groceries, will keep the cold things cold for the 30-45 min. it takes to drive home. Remember to pack the cold stuff at the bottom. If your large boxes move around too much (mine don't) bungie cords in strategic places as y'all mentioned, will keep them from moving around.
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