Deployable Cover: For this purpose – and assuming that people are firing material objects at you, which is, in fairness, most of the time – they do make portable kinetic barriers.  (Don’t try and use them while you’re still carrying them, though.  All that kinetic energy has to go somewhere, so you either need to spike it to the ground (if it stays as KE) or plug it in to a giant heatsink (if it doesn’t), neither of which are available to you during transport.

Well, unless you’re wearing a combat exoskeleton, but those come with their own kinetic barriers, so you don’t need another set.