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How to hold two mattresses of a daybed/trundle bed together?

What I am looking for is something that will hold the two mattresses of a daybed/trundle bed together.

Public Comments

1. rope, duct tape, bungee cords. hey... endless possibilities
2. Walmart has this roll of industrial velcro in the sewing area that I have used for all kinds of heavy duty things like attaching grow lights to cabinets etc........It had the velcro side and the sticky side, so it should work great. There is also the kind that you sew on, but I am not a sewer!