noun
Yu-Pack; Japan Post domestic parcel delivery service
Trademarked name for Japan Post's domestic parcel delivery service. Often used generically to refer to sending a parcel via this service.
この荷物はゆうパックで送ります。
I'll send this package by Yu-Pack.
ゆうパックの料金はサイズと重さで決まり
Yu-Pack rates are determined by size and weight.