The item is an explosive pack, or so EU/books go... Not a monocular... At least I've never seen anything list it as that. It's supposedly a little bomb/grenade doodad.
I'm happy to get one really, but yeah since past Sandies came with it on the belt and the pack fit, I'm not sure why they didn't just do that?
Hasbro's weird like that. Why make a NEW backpack for htis figure? You have at least 2 good sculpts of the Stormtrooper's field pack available to you, why not use them instead of a new one? Or is this not new?
I haven't picked him up yet...
Anyway that should be a butt bomb on there, though I guess it does look like a monocular too, but that thing's listed as a bomb everywhere I've seen, so that's what I'm going with.