A lifejacket pouch in the form of a pocket (3), is located beneath the seat surface of an aircraft seat. Wall pieces (17) move relative to each other and may be fixed in a position adjacent to each other along an opening edge (7) of the pocket (3). A closure device includes at least a pair of retaining elements to generate a closing force acting between the wall pieces at the opening edge (7). The elements may be overcome by a manually-operated tear-strip (13) for opening the pocket (3), having a tie strip (11), acting on the pair of retaining elements. A combination of a press-stud closure and a tie strip (11) on the tear strip, through which the above extends, offers a high closure security and a possibility of opening particularly simply and rapidly with a good closing force. At least one pair of retaining elements includes a press-stud closure (21, 23). The tie strip (11) has an opening (25) through which the press stud closure (21, 23) extend.