I used one of them a lot up around Rabaul, the northern end of the Solomons, & points north of there. Usually 3 Oz terylene, they are meant for breezes below about 6 knots, usually full cut, but still designed for going to windward. Polling them out down wind
will usually turn them into a rubbish bag pretty quickly.
Great in the light winds near the equator, particularly in a left over sea that will have heavier sails slatting around as you roll. I would sheet the main in dead hard, like a board to stop the rolling, winch the luff of the drifter up hard, "drift" along at a few knots. A lovely was to spend a lazy day.