I can’t stress the importance of having a very good poncho on Kilimanjaro. When a downpour starts, which is usually on the first few days, you should be able to quickly put on a poncho, and it should be able to cover your day pack, which generally is holding your water, lunch, and a few other items.
The problem is that many people buy cheap garbage bag style ponchos that rip within the first few hours. Don’t buy a poncho that costs two dollars. You should buy a descent one with strong seams that will last under rugged conditions and be big enough to fit over your head and your daypack while keeping your completely dry.
This interview was done on Mt. Kilimanjaro