A perfect size backpack for traveling, that can become really small, as shown on the front, and can get pretty big extended. Fits perfectly into airplane overhead bins (perpendicularly/space saving). I used it a lot this way, instead of checking in luggage. Because of all the pockets on it on the outside, you can fit a lot in it. CONDITION: Perfect outside. All zippers and clasps working, nothing torn or stained. Inside waterproofing layer has become "sticky". I am assuming it's just its age, because I kept it stored well, and always took good care of it. Has internal frame support and waist belt making it much easier to carry bigger loads, and to move around freely. Has air circulation system at back, so you don't sweat wearing it. Color is DARK GREEN, not grey. Camera wouldn't show the colors right. Except for the interior that is sticky, this is an excellent backpack. Price reflects this condition. I'm only selling it because I injured my back and can no longer carry anything but tiny backpacks.