A containment device that converts between three different configurations or forms and includes a multilayer base. The forms include: 1) a mat or work surface that has a raised lip or edge structure that contains items on the mat or work surface; 2) a small volume bag or flexible container for holding the items inside, where the lip is gathered or compacted, e.g., by a drawstring, to form an annulus from the lip; and 3) a larger-volume, cylindrical-shaped bag, which may be used as a shopping bag. The cylindrical-shaped bag may be stored between the layers of the base when the device is in the mat configuration or the drawstring bag configuration, and the lip may be stored between the layers of the base when the device is in the cylindrical-shaped bag configuration.

A reusable mailer includes a carrying volume having a top opening configured to receive a package therein, the carrying volume defined by an outer and inner peripheral surfaces, the inner peripheral surface covered by a plush material. Protective tape having a first portion is configured to removably adhere to a rear portion of the outer surface and is configured to extend across the top opening and a second portion is configured to removably adhere to a front portion of the outer surface to close the carrying volume and configure the carrying volume for mailing purposes. After mailing, the protective tape is selectively removable from the front and rear surfaces to expose the package. Once the package is removed from the carrying volume, the carrying volume is selectively inverted to transition and expose the plush material on the inner peripheral surface.

Pack systems are convertible or transitionable to different configurations in which the systems may be used in different manners. These different manners include using the systems similarly to typical luggage, using the systems similarly to typical backpacks, pulling the systems similarly to a typical sled, using the systems as seats in rafts, and/or using the systems as supports for tables. Pack systems also facilitate replacement of typically relatively easily damaged components, such as wheels and handles.