SoundSkins Subwoofer Enclosures

I have a 2016 crew max non-JBL, currently planning/acquiring for a full audio system upgrade.

I ordered this enclosure from SoundSkins. Not received it yet.

https://soundskinsglobal.com/produc...bed-liner-spray-finish?variant=41527069671498

I'm trying to match a pair of subs to it. I tried to get some clarification from SoundSkins and was told that it's a common chamber with 0.8 cubic feet total air space. That seems really small. I'm not even certain I'd find a pair of subwoofers that would appropriately work in that box. Interestingly, when I put the provided enclosure dimensions into Rockford's online tool, it comes up with 1.2 cubic feet. I suppose I may just have to wait til the box is here.

Has anyone used one of their enclosures?

 

Dimensions calculate closer to 0.6 cuft per side.
48" wide - 1.5" for material width is 46.5"
17.25" tall (average) - 1.5" is 15.75"
4.375" depth (average) - 1.5" is 2.875"

46.5 x 15.75 x 2.875 is 2105.6

2105.6 divided into cubic ft is 1.22 cuft like the Rockford calculator said.

 

I appreciate the breakdown and reassurance. Unless the thing is full of bracing, I'm not sure how it could only be 0.8 ft³. I think I'll wait til I have it before ordering the subwoofers.