It’d be good if you could save a power up in your jersey pocket for later, if you get a feather would be good to save it for a climb or an aero boost for downhills.
you could have one in the pocket and then get another if you pass a check point (a bit like if you are using one as you go over the start finish line)
you could only save one so not hoard loads and then use them one after the other though!