A new and distinct cultivar of Hypericum plant named Bosaja, characterized by its upright and outwardly spreading plant habit; dark green-colored leaves; shiny green-colored fruits; and good postproduction longevity. Preferably, the releasable latching members include an elongate channel on each support member and two skirt-portions on the surface element. Therefore, the bonding of the first member and the second member is facilitated, whereby sealing performance around the groove is improved.