As previous reviewers have written, it is too small for a comfortable sleep for an adult. When lying down, it is difficult to straighten up in it, and the edges dig into your shoulders. Lying diagonally is completely out of the question. It's nice to sit or lie in it with your legs bent. Advantages: light, compact, does not stand out in the field, does not restrict your view. Minus for the attachment cords, they are too short and need to be replaced.