Figure 24: The shape of a simple tuck fold.

The first tuck is a tuck fold applied to an airbag which has not been folded yet. Such an airbag is flat and composed mainly of two layers: upper and lower. It is assumed that there are no pieces of fabric between these two layers. Otherwise, the tucking operation could possibly create intersections between these pieces and the parts that are pushed inside.

In the example in Figure 24, only two parameters determine the shape of the airbag: E, which is the equivalent of the minimum element size, and G, which is the equivalent of the minimum gap of the simple folding case.