If you want, you can add a dab of hot glue to the end of the tied bracelet. This will make the bracelet more secure, and you will be more comfortable that it won't slip off.
If you want a solidly-knotted bracelet, use strings that are approximately 2 yards long for a bracelet. If you only plan to knot 10 knots, you can get away with...
One simple and inexpensive friendship bracelet is formed by choosing 3 complementary colors of 6-ply embroidery floss, enough for several bracelets. Cut 48 inch lengths, fold in half, cut the...