Practical light weight universal bag for use on the slopes or elsewhere. The Dog apartment has one big compartment and one smaller. When empty it is very flat and takes up little space. The Dog apartment can handle quite a lot of volume. It is now upgraded in the 2.0 version with straps for easy transport of your Sled Dogs, inline, hockey or other gear, more inner pockets, hole for your earphones etc. This is a great universal bag.