Camco RV Standard Battery Box, Durable Woven Hold-Down Strap (55362)

This box is almost air tight, it has two slits in it that should be safe from the rain, but the holes for the wires you need to drill yourself. It comes with a strap and a couple of plastic brackets. The brackets are screwed down to the floor, the strap goes through them and over the battery box. At the top of the box the strap buckles. It is difficult for me to describe this plastic, but I will try: Its not fragile plastic, its the kind that will elastically bend to about 37 degrees, 45 degrees or more would probably leave a white crease, and it may or may not survive a heavy blow without cracking.

This is a good battery box when you can catch it on sale. Fits a group size 24 marine battery just fine. Mine came with the box and top and it also came with a nice tie down strap to secure it in a boat.