I've had the chance to participate in some "build in the bag" contests at some events. The idea is simple: each contestant gets a small set (usually provided by LEGO for the occasion), and everybody tries to build the set at the same time.
The trick is, the contestants may not open the bag but should build the model inside it. The first to finish wins some additional prize. You can also up the ante, PLUG did for example do this underwater.
However, this does require that all parts of the set are in exactly one transparent polybag. Small racers sets (the one in plastic boxex with a round top) are usually suitable, but we've had a club event where we wanted to do that and there was no polybag (the first to open his box spilled the contents on the ground), so we had to find some other contest (I think we ended up with one-handed build or build without plan).
So my question is, which sets are known to have all parts in one polybag? Is there any way to find out?