Frogg Toggs Ponchos
An excellent no nonsense poncho lots of room at a very low price, could double up as a ground sheet for picnics etc. We bought ours to keep birds dry when it rain, as we are volunteer bird banders.
It is excellent to keep in the car. We recently went to a state fair. I tossed a few of these in a back pack and when it started raining, the kids were all set. They are much better than those cheap one time use ponchos that the fair was handing out.
I needed this item for travel to London & I did not want to pack a raincoat. It is fine - I just wish there was a smaller version for toddlers.