Abstract: A holder for mounting a plastic bag from a mower guide having a transverse handle and a pair of downwardly and forwardly extending legs, the holder having a rectangular frame defining a vertical opening for admitting a plastic bag therethrough which is folded along its upper edge about the fame and held thereon by a clasp which is mounted on an upright leg connected to the frame, the upright leg is hooked at its upper end over the handle and the side portions of the frame being provided with laterally extending hooks which hook about the legs of the mower guide, the frame being resilient and the laterally extending hooks being stretchable to resiliently embrace said side portion to hold the frame and bag assembly from bouncing loose when moving with the mower.