paper bag

In Other models on February 23, 2013 by romi


Last week, my niece prodded me to fold the origami lunch bag which she saw in Matthew Gardiner’s Everything Origami. That model by Darren Scott is folded from a square paper. After making one, I thought of coming up with my own version, using the rectangular A4 paper. For the model depicted above, I used a page of a wall calendar. It’s big enough for a couple of sandwiches.

The first three steps in folding my version are borrowed from Scott’s model: 1. The paper is folded/unfolded in half, horizontally; 2. The paper is then divided into thirds horizontally; 3.A valley fold is made between the top crease and the center crease, and then between the center crease and the bottom crease.

For the next step, I unfolded the paper and folded the two vertical sides of the paper toward the center.
Step 5 involves swivelling the top side straight up at 90 degrees. In step 6, the bottom side is swivelled up. At this point, the bag is formed, with two triangular flaps created inside at the base. Finally, the top part of the bag is mountain-folded by about three-fourths of an inch.

I came about with the last four steps intuitively; that is, by doodling. But I found out later that the finished model is very similar with the shopping bag model of Fred Rohm featured in Jay Ansill’s book Origami Sourcebook. That one also made use of the swivelling technique as described above. The main difference in the folding procedure is that, in my version, the portions of the paper that make up the narrower sides of the box are folded in a precise manner: as described above as step 4, the two vertical sides of the paper are folded toward the center. On the other hand, in Rohm’s version as presented in Ansill’s book, the two sides are folded arbitrarily.

According to master origamist David Brill in his book Brilliant Origami, the phenomenon wherein two or three origamists come up with identical models, as he himself experienced, “is an increasingly common occurrence, when simple shapes and geometries are being explored. The important point is surely that the design you came up with is original to you at the time, even though discovered separately by others.”


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