I am so dissapointed with these! You MUST get a pump or they do not blow up! We spent 20+ minutes trying to inflate one and were red in the face when we gave up. It was also very difficult to deflate too. The fabric is very thick and these are very heavy. I would never be able to take these on a long hike because of the weight. I thought I was getting something I could blow up with lung power relatively easy, this is not at all what I was thinking they would be.