How do you secure your subwoofer enclosure?

I'm going to be putting in some dual 12's in a sealed box in the trunk. I'd like to be able to quickly remove the box when storage is needed, so I'm wondering how other people secure their boxes. Velcro won't make me feel secure enough, and tie-down straps look bad, but seems to be the only possible possible. How do you manage?

Two of these on the back side of the box. The hinge is attached to the box and the other piece gets attached to the floor of your trunk. You can put two little padlocks or carabiners through the latch to keep it in place and then just remove them when you want to take your subs out. They are plenty sturdy to keep a box down, invisible with the box in, and you can still take the box out quickly.

 

http://www.homedepot.com/catalog/productImages/400/1e/1ee63464-c4db-4f6b-b35e-cdef19277182_400.jpg

Awesome, thank you for the idea