Disclosed herein, in one aspect, is a sack for holding a pillow. The sack includes a body defining a pocket that is sized to receive a pillow. The body has a top and a bottom that are spaced along a first axis and first and second lateral ends that are spaced along a second axis that is perpendicular to the first axis. The pocket has an opening at the first lateral end of the body. The sack further includes a sleeve extending outwardly from the body. The sleeve defines a receiving space (e.g., slot) extending along the first axis. The slot is configured to receive (optionally, receive therethrough) a handle of a suitcase.