I bought this sack in XXXL (75 liter capacity) size to pack my two sleeping bags and four camp pillows (that you can fold them), with the aim of make this set of sleeping bags and pillows less bulky and make some room. Well, after puting all the stuff inside I got a nice surprise, the sack shrinked down to half its original size. Puting this compressed sack inside my 80-liter capacity backpack is simply awesome, I can put more things inside the backpack.As mentioned, I got the XXXL size and it came in color blue.