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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?

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How about 'What sets can be bag-built?' for a title? – Ambo100 Dec 11 '11 at 21:24
Looks like there was a custom bag built for the ISS model that was taken up to the station, which probably doesn't count: Satoshi Furukawa with the LEGO Brick Kit aboard the ISS – Zhaph - Ben Duguid Jan 9 '12 at 22:09
up vote 6 down vote accepted

The ones I know of:

In addition, some LEGO Creator sets, with only partly transparent bags are possible to build in bag, like this video shows - but it gets a lot harder.

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Rather then listing all of the sets, I'd go by the general rule that sets that are 9.5cm x 9.5cm x 4.5cm or smaller are in one bag (or just in the box). The Court Jester (7953) is one exception in that the Jester hat is packaged separably. – Ambo100 Dec 11 '11 at 21:28
I suppose we can exclude bigger sets (or sets with more than x pieces, with x to define), but there are a lot of small sets (such as the one you mention) which don't qualify, and that's a problem. – Joubarc Dec 12 '11 at 5:24
Some of the bigger sets will have one bag per part of the set, for instance this train set where the platform can be build from one bag. – SQB Feb 24 '14 at 8:59

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