Abstract: A collapsible storage device which can be attached to the underside of a surface such as a desk top. The storage device includes a top panel, a bottom panel, a first side panel, a second side panel, a rear panel, and a fastener. The top panel and bottom panel being are formed of a substantially rigid material. The first and second side panels and the rear panel are formed of a flexible material. The first side panel is affixed to the top panel and a the bottom panel. Similarly, the second side panel is affixed to the top panel, and the second side panel is affixed to the bottom panel. The rear panel is affixed to the top panel, and the rear panel is affixed to the bottom panel. Additionally, the fastener is affixed to the outward facing surface of the top panel. The storage device can also include an attachment device on the inward facing surface of the top panel. The attachment device can attach to the inward facing surface of the bottom panel.