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By using high-density polyethylene “bladder” bottles redesigned with a flattened base and “feet” that allow them to stand up on the conveyor line, a producer of a topical livestock insect repellant treatment was able to increase filling line efficiency and eliminate the need for pucks to hold the bottles on the filling line. The new 1- and 2.5-L bottles, from Airopak, a subsidiary of Novapak, replace rounded bottles that could not stand upright, so they had to be placed vertically into pucks for filling.