Autonomous, crowdsourced parcel delivery services using personal vehicles have been growing recently in many parts of the world in response to the demand for the rapid delivery of purchased products in urban areas [32; 33]. The vibration levels of these vehicles in the U.S. have been measured by previous researchers [28]. The vibration levels of various motorcycles, which are commonly used for parcel delivery in Southeast Asia but are not common in other parts of the world, were also measured in previous studies because of their unique characteristics [31]. These studies clearly show that many different versions of vehicles are used in last-mile deliveries, and they have unique vibration characteristics. Therefore, characterizing the vibration levels of commonly used last-mile delivery vehicle types in different geographical regions is extremely important to properly simulate their harshness and unique characteristics, such as different peak intensity frequencies, which could increase transmissibility. E-commerce is a trending and emerging type of retail service in Korea. In 2022, annual online retail transactions in Korea accounted for 33.6% of the total retail transactions. They also had the second-largest ratio of e-commerce to retail distribution market in the world in 2021 [34; 35]. Moreover, online retail transactions, excluding non-product delivery services, such as travel and transportation services, culture and leisure services, e-coupon services, food services, and other service transactions, accounted for 73.7% of total annual online retail transactions in Korea [35]. One key factor that serves as a cornerstone of the rapid growth of e-commerce is a fast and convenient parcel delivery service along with an advanced and efficient courier network. Accordingly, parcel delivery volume in Korea has significantly increased. Parcel delivery volume increased by 158.2% between 2012 and 2021, and it increased by 7.6% in 2021 compared to the year before [36]. Due to regulations in Korea limiting the cargo capacity of last-mile delivery vehicles to less than 1.5 tons, more and more small cargo vehicles, commonly known as '1-ton trucks', are being utilized for Korean last-mile delivery in order to cover this increased parcel delivery volume. This unique practice differs from other countries where vans or motorcycles are predominantly used for parcel delivery. However, Korean packaging engineers still rely on the last-mile vehicle vibration test profiles recommended by international test standards due to the lack of test profiles specific to the Korean delivery environment. Most internationally used vibration profiles for parcel delivery vehicles were developed to simulate commonly used parcel delivery trucks in the U.S. Considering the large size of the e-commerce market and the booming parcel courier industry, proper understanding and simulation of the unique characteristics of the Korean parcel delivery system could create significantly positive synergy for packaging engineers in many ways. For example, it could provide cost and waste reduction opportunities by cutting out overused packaging materials, and it will help achieve higher customer satisfaction due to reduced product damage rates through the testing and optimizing of packages using properly simulated vibration test profiles. A properly optimized packaging system can easily contribute to lightening the weight of the packaging materials used. It is called a linear reduction strategy and is sometimes considered more critical for packaging sustainability than developing new packaging materials [37]. However, despite the anticipated positive synergy between improving parcel packaging through the proper simulation of different vibration levels experienced by parcels across the various last-mile delivery vehicles and regions in Korea, the unique vibration characteristics and a general last-mile vehicle vibration test profile for the Korean distribution environment have not yet been studied and established. This research is the first of its kind to address this topic.