Housing blank and activation member for a medicament delivery device, a kit comprising such blanks, and a medicament delivery device

A housing blank for a medicament delivery device, comprising:

• a mid portion having a through-opening configured to receive a proximal end portion of a medicament container assembly having a distal end portion opposite the proximal end portion;
• a first leg defining a first housing side wall and extending from a first end of the mid portion;
• and a second leg defining a second housing side wall and extending from a second end, opposite the first end, of the mid portion;
• wherein the housing blank has a first fold line that separates the first leg from the mid portion, the first fold line enabling folding of the first leg relative to the mid portion;
• and the housing blank has a second fold line that separates the second leg from the mid portion, the second fold line enabling folding of the second leg relative to the mid portion, where folding of the first and second legs towards each other forms a housing end wall that will accept the distal end portion of the medicament container such that housing end wall abuts and surrounds the distal end portion to lock the first and second legs relative to each other in a folded position, wherein each of the first and second legs has guides arranged to directly engage with respective guide followers of a movable activation member.