וְנָתְנ֤וּ אֹתָהּ֙ וְאֶת־כָּל־כֵּלֶ֔יהָ אֶל־מִכְסֵ֖ה ע֣וֹר תָּ֑חַשׁ וְנָתְנ֖וּ עַל־הַמּֽוֹט׃
And they shall put it and all the vessels thereof within a covering of sealskin, and shall put it upon a bar.
Read kabbalistic (mystical) interpretation of Numbers 4:10: and classical mystical sources.