I like the heavy ponchos, we have used them for many trips, they hold up better and keep you drier and warmer than the cheap ones that are about as thin as saran wrap. It can get very windy when it rains and I have seen the cheap ones blow up into peoples faces, also sometimes the temp drops with the rain and they do help keep you warmer. We just have each person fold theirs over the strap on their hip pack, they will stay put just fine. As far as lockers are concerned, be aware that Florida rains can appear without warning and it is a loooooooooong way back to the front of the park where the lockers are, especially if you are in Epcot. We always figure that carrying a poncho is a way to guarantee good weather, if you leave it behind just once, that is the day it will rain for sure. A cap with a bill such as a ball cap is good to have along too, wear it under the hood of the poncho to hold it in place, otherwise the water will just drip into your face. We use them at night to sit on when watching Fantasmic, those metal benches are cold! If it is a chilly day we use them to ride Splash Moutain and other rides we might get wet on, makes them more do-able.