Abstract: A holder apparatus, being attachable on a wheelchair frame for holding a catheter bag and the like, includes a pouch defining a rectangular-shaped compartment closed at its bottom and open at its top for permitting a catheter bag to be easily inserted therein or removed therefrom, and attachment components in the form of an elongated pivot rod mounted across the pouch adjacent to the closed bottom thereof and being adapted for mounting the pouch to a portion of a wheelchair frame so as to locate the pouch below and behind the wheelchair seat. The attachment components also include a pair of clamps connected to the opposite ends of the pivot rod and being adjustable for attaching them upon and releasing them from the wheelchair frame portion.