A mobile device case is disclosed. The mobile device case includes a body portion and a bottom portion. One portion includes a gasket configured to sealingly contact both the body portion and the bottom portion. The body portion and the bottom portion include mating curved surfaces. The gasket is a curved gasket that mates with the curved surfaces of the body portion and the bottom portion. The body portion and the bottom portion include a connection arrangement configured to releasably connect the body portion to the bottom portion. The connecting arrangement includes at least a first locking arrangement disposed in part on the first side of the body portion and the first side of the bottom portion.