A clamshell dispenser for film bags includes a planar base shaped to fit beneath a bag roll. Side travel limiters are attached to the base. A retaining bracket is hingedly mounted adjacent a front edge of the base to prevent the roll from moving outwardly from the dispenser when the bracket is latched. The bracket opens for introduction of the roll. An upward facing snagging hook engages either a chisel cut or a perforation in bags from the roll. A downward facing snagging hook may be attached to the retaining bracket. An adapter for a bin includes first and second bag dispensers mounted to a fixture. The fixture is shaped to fit within the bin. First and second axles are orthogonally attached to the fixture. The axles mount first and second positioning wheels that are located to slidably engage first and second integral channels in vertical sides of the bin.