It is very comfortable whether it is placed in a bag or directly held. it made it less than 900 miles and ripped open in the rain. I also tested it in my home with normal US plugs, works very well. Probably would have been four or five star worthy had it not been for the quality control. They need to post a new image. Compré otro producto de otra marca para ahorrarme un dinerito, grave error. Espero que esta opinión te haya sido útil :) The serial number is the same for left and right shoe. The sandals are wonderful. I read thru the reviews and put the zipper opening in the back as suggested.