These compression bags are color coded for size. Four vertical compressors with removable top cap and a fixed bottom with a pull handle. Two of the compression straps have quick release buckles and the other two have ladder locks. This allows you to quickly compress your bag and to open it up with ease. All stuff sacks come with black caps. Make sure you have enough compression bags for your sleeping bags and clothes. It will change your camping life. You will find you have more available space in your canoe packs.