Badgers - Supreme Deities Wrapping Of Choice
Here is the proof.
Yes indeed, one of the most sacred artefacts ever discovered by Indiana Jones - the Ark of the Covenant - was WRAPPED IN BADGER SKIN.
Presumably this is because only the most awesome skin could contain the evil Nazi killing rays that are contained within the Ark. Also, the fact they had a blue cloth around it too is obvious proof they didn't want to get that badger skin dirty or anything.