I was mislead by one of the other comments saying an 18 or 19" laptop wouldn't fit. The other comments are more accurate - it's huge! My 17.3" laptop rattles around inside it (it's going back). The inside compartment measures just shy of 19" wide x 14.5" deep (and this is the problem bit, as it has a movable velco arm that means you can adjust the available width, but you can't do anything about the depth and the strap to hold it in place doesn't really make up for it being 3.5" too deep). The padding is fine for the price.