A host organizer includes a casing, a pocket, and an organizer flap. The pocket is located on the exterior surface of the casing. The pocket contains a first attachment element. The organizer flap extends from the casing and over the pocket. The flap has a second attachment element. The second attachment element is complementary to and alignable with the first attachment element, such that the flap is releasably attachable to the pocket. An ancillary article includes a body and an article flap. The article flap contains third and fourth attachment elements. The third attachment element is complementary to the first element, and the fourth attachment element is complementary to the second element. The body is configured to fit in the organizer pocket. The article flap is adapted to overlap the organizer pocket such that the third and first attachment elements are aligned and the article flap is releasably attachable to the organizer pocket. The organizer flap is adapted to overlap the article flap such that the second and fourth attachment elements are aligned and the organizer flap is releasably attachable to the article flap.