Knots to Shorten Canteens?

Civil War soldiers were issued canteens with straps generally too long to be comfortable while on the march. Thus, many soldiers shortened the strap to make the canteen sit just above the hip or right under the arm. But how did they do it? What was the most common way? Did they tie knots in the webbing? Did they overlap the strap and sew it together? Which method was most popular?
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