This paper reports the field experimental study and test results of polyester unanchored straight geostraps. This study is a part of an extensive study is currently underway to understand the behavior of these walls under seismic lateral loads. In an on-going GRS-RW project in Padang Pan-jang, West Sumatera, Indonesia, a series of additional geostraps was installed and subsequently tested. This paper describes the fill and geostrap materials and the pullout system, and discusses the test results and overall behavior. Five geostrap samples having different lengths and vertical confining stresses were tested. The failure mode of the geostraps was mostly the rupture of geostrap material, which involved a much higher pullout force than the calculated capacity. The pullout secant stiffness is discussed, and the stiffness decreased with an increase in displacement. For displacement < 20 mm, the variability of stiffness was high, while for displacement > 20 mm, the variability is relatively low.