The US Army Pathfinder School Nomenclature Practice Test

The sling weight of a Polyester Round Sling is determined by its length and the materials used in its construction. In this case, a 70-foot long Polyester Round Sling typically has a sling weight of 81 lbs. This weight accounts for the density and type of polyester fabric used in the sling, which is strong yet relatively lightweight compared to other materials. Therefore, the listed weight reflects the median weight typically assigned to this length and material, making it the correct choice.

It's also important to understand the context of sling weights in practical applications. Different lengths and materials will have varying weights, often used for military and logistical operations where accurate weight measurements are critical for safe handling and transportation of loads.