Abstract: A specially configured bag holder for releasably securing a trash bag or the like. The bag holder has a hoop with an annular shoulder for carrying the bag, a spring-biased cord for releasably retaining the bag on the hoop, a rigidifying structure including a U-shaped brace with rigidifying arms and a mounting bar which engage the hoop, and at least one removable bracket assembly mounted upon a support structure such as a wheeled cart, post or wall. The removable bracket assembly includes an upright support lug and a fastening assembly for securing the lug to the support structure while simultaneously spacing the lug from the support structure to define a pocket between the support structure and the lug to receive the mounting bar.