A twist-lock button configured to securely fasten two articles together. Such a twist-lock button may have four pieces: a handle, a locking portion, a negative, and a button adapter. The negative attaches to an article by way of the button adapter. The locking portion attaches to the handle and passes through a button hole in the article to join with the negative by twisting 180 degrees, thereby fastening the two portions of the article together between the handle and the negative. This mechanism is more durable than hook and loop fasteners, more reliable than buttons and snaps, and less prone to jamming than zippers. In addition, the twist-lock button is easier to use for people with muscular or motor disabilities, such as cerebral palsy, ALS, stroke recoverees, and amputees.

A mounting system can be used to releasably attach a first item to a second item. In one example, the first item can be a protective encasement for a mobile electronic device, and the second item can be a bicycle mount, suction cup mount, vehicle surface, office surface, or home surface. The mount assembly can include a first housing portion connected to a second housing portion, and can include a cam and torsion spring disposed within a housing volume defined by the first and second housing portions. A recess in the mount assembly can receive and retain a mounting cleat associated with the first item. One or more clasp mechanisms of the mount assembly can be configured to clasp the mounting cleat when it is inserted into the recess and to release the mounting cleat when the first housing portion is rotated relative to the second housing portion.