http://www.nexusmods.com/skyrim/mods/51627/?tab=1&navtag=http%3A%2F%2Fwww.nexusmods.com%2Fskyrim%2Fajax%2Fmoddescription%2F%3Fid%3D51627%26preview%3D&pUp=1

This mod makes the spriggan in Snapleg Cave a potential follower who is flagged essential, and gives her some of the spells most other spriggans have, other than that, she is entirely unaltered. Yes she can carry things, and do anything vanilla companions can, other than equip what you give her.