The design and the early commissioning of the ELI-Beamlines laser facility 30 J, 30 fs, 10 Hz HAPLS (High-Repetition- Rate Advanced Petawatt Laser) beam transport system is described in detail. It is the world’s first and with 100m length, the longest distance high average power petawatt (PW) beam transport (BT) system ever built. It connects the HAPLS pulse compressor via the injector periscope with the five dierent target chambers located in four dierent experimental halls. The 4.5m diameter P3 target chamber of the plasma physics group in hall E3 is the largest target chamber of the facility and was connected first to the BT system. The major engineering challenges are the required high vibration stability mirror support structures, the high pointing stability optomechanics as well as the required levels for chemical and particle cleanliness of the vacuum vessels to preserve the high laser damage threshold of the dielectrically coated high-power mirrors. A first commissioning experiment shows the full functionality of the beam transport system and the novel experimental infrastructure.