Need help securing my sub

[VTLexus 10+ year member]

I just put a single 12" in the trunk of my IS. The problem is that the box is longer than it is deep so it can tip if i slam on the gas.

what are good ways to secure the box? i don't want to bolt it down onto the trunk floor. any other ideas? i prefer a solution that allows me to move it if need be.

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[azbass 5,000+ posts]

fab something to the box that attaches to the top of the trunk.