Which board?

[-MH-]

Considering building a box for my pick-up (i.e., it should withstand water). Is there a suitable building board for this purpose (in wood-like material)? It doesn't need to last 100 years, but at least 10, for outdoor storage.

Or if anyone knows of an aluminum box with an inner length of 2 meters...

 

[DeEss]

Formplyfa should be able to handle it...
Okay, in ten years the box might look pretty worn out, but it's cheap material compared to, for example, aluminum.