###### Abstract
[17] compared the next-day air parcel delivery environments of the United States Postal Service (USPS), FedEx, DHL, and UPS. [PERSON] and [PERSON] [12] expanded the parcel shipping environments measured to include different geographical regions than the USA. They measured the express parcel shipping environment of Western Europe and proposed a new drop test protocol for this region. Meanwhile, [PERSON] et al. [15] also conducted parcel shipping environment measurements of the transcontinental international air shipping services of DHL and FedEx between the USA and Europe. [PERSON] et al. [20] collected data for the US ground shipping environment for products packaged in pains, while most of the historical studies focused on products packaged in a box shape. [PERSON] et al. [14] measured and compared the inter-state and intra-state next-day shipping environments within the USA. In recent years, research on the express parcel shipping environment for small packages was also conducted in China [13]. [PERSON] et al. [11] recently investigated the ground shipping environment for loads of packaged parcels in Korea, including the drops and vibrations that the parcels experience. The study was conducted using five different package types and two different couriers. However, this study had multiple critical limitations to it being used for establishing a new regionalized package testing protocol. The study omitted analysis of the impact orientations that could help decide which drop orientation should be included in the test protocol to simulate the shipping environment as similarly as possible. The study lacked statistical analysis of the number of drops and drop height results and only provided average numbers. Although ISTA 3A [22] and ASTM D7386-16 [23] are viewed as renowned international standards, their shock testing sequences are built predominantly to simulate US delivery systems. However, historical studies have proven that different countries have unique characteristics to the shock events that packages experience during transportation. For example, packages transported in different countries can experience different numbers, extents, and directions of shock events based on the various warehousing technologiesused in the countries; they will also have different loading/unloading methods, sorting technologies, and numbers of handling points. Therefore, the previously introduced historical studies have provided valuable data on which packaging engineers can base the establishment of laboratory package testing procedures that reflect their country's environment. The International Safe Transit Association (ISTA) is also conducting major research work on characterizing the shock and vibration profiles in different countries' package distribution systems, such as China, India, European Union, Mexico, and Japan, in order to have more country-specific package test profiles [24; 25]. This implies that characterizing package distribution environment hazards is highly demanded and needed by the industry. However, due to the lack of regional standards, packaging engineers in Korea are still relying on international testing standards, such as ISTA 3A [22] and ASTM D7386-16 [23], to test their packages. Given the limitations of previous studies and the lack of information on the shock environment in the Korean parcel delivery system, one of the largest food companies in Korea, CJ Cheiljedang, and one of the leading Korean logistics companies raised the need for a more extensive study to fully understand the ground shipping environment and establish proper parcel testing for Korea. This study selected ground shipping services to investigate since they account for 93% of parcel delivery in Korea [26] due to their shorter delivery distances when compared with larger geographical regions such as USA, Europe, or China.