Drug Delivery Device Comprising a Cap

Provided herein is a drug delivery device including a housing having a first end including a distal region and an adjacent proximal region, where in a first region configured to engage a clip from a cap, the distal region includes a raised plateau region relative to an adjacent region of the distal region and the proximal region includes a recess adjacent to the plateau region; and the cap including a distal end and a proximal end, where the proximal end of the cap is engageable with the first end of the housing, where the cap includes a wall defining a perimeter and the clip protruding from the wall at the proximal end of the cap, where when the housing and the cap are engaged, the wall of the cap is in contact with the plateau region of the housing, and the clip resides in the recess of the housing.