Plays a role in vesicular protein sorting. Component of the membrane-associated retromer complex which is essential in endosome-to-Golgi retrograde transport. Required for the auxin-carrier protein PIN2 sorting to the lytic vacuolar pathway and the PIN1 recycling to the plasma membrane. Also involved in the efficient sorting of seed storage proteins globulin 12S and albumin 2S. The VPS29-VPS26-VPS35 subcomplex may be involved in recycling of specific cargos from endosome to the plasma membrane. Component of the retromer complex which consists of VPS29 (MAG1), VPS26 (VPS26A or VPS26B), VPS35 (VPS35A or VPS35B or VPS35C), VPS5/17 (SNX1 or SNX2A or SNX2B). Component of a retromer subcomplex consisting of VPS29 (MAG1), VPS26 (VPS26A or VPS26B), VPS35 (VPS35A or VPS35B or VPS35C). Dwarf phenotype. Reduced primary root length and fewer secondary roots. Abnormal cotyledon shape, number and positioning. Accumulation of storage proteins globulin 12S and albumin 2S in dry seeds. Belongs to the VPS29 family.