Abstract: The invention relates to a bag that includes a shell having a predetermined maximum vertical rise. A channel is connected to the shell. An elongated strap has a first portion and a second portion. The first portion is disposed within the channel, and the second portion is exposed from the channel. The strap is moveable with respect to the channel thereby causing the shell to cinch and the bag to assume a vertically constrained size while a carry strap increases in size. Optionally, the carry strap has an adjustable length to meet the needs of users of various height and having differing notions of how to wear the bag on their bodies.