This part of IS0 7965 specifies a method of vertical impact testing on a filled paper sack by dropping. It may be performed either as a single test to investigate the effects of vertical impact or as part of a sequence of tests designed to measure the ability of a sack to withstand a distribution system that includes a vertical impact hazard. This part of IS0 7965 specifies the testing procedure and how the results of tests should be presented. It is based on IS0 2243, but is specifically related to paper sacks.