We divide a crew into teams and have the teams begin from either side of a window or doorway. To get a tight fit where two teams come together, fill the last two bags full enough to fill the remaining space and lower them into place at the same time (Fig. 3.37a & b). When working alone you can hard-pack (mild hard-assing to the full desired height) the last bag to make it extra fat, but leave it an inch (1.25 cm) shorter than the space you are filling. Drop it in. It should have enough room to fit in, but barely any space left between it and the other bags. When tamped from above, it will pound down and fill any gap.
Make sure the bags meet on equal terms. They should be flush up against each other, not one on top of the other. They should make a vertical seam where they meet, the reason being that when the row is tamped into place from above, the bags will "shoulder" into each other, limiting their movement. When they overlap (even a little), they tend to ride up onto each other and stray from the pack (Fig. 3.38).
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