Gave it 3 stars bc of its shortcomings, unit is well built but dimensions need to be larger.  However, if you need a light wheeled cart for your backpack this is the one.  I carry a 40# photography backpack (a Lowepro Pro Trekker 400 AW) everywhere I go on a shoot and the heavy pack gets old.  This unit relieves the weight issue but if you are not careful the cart will tip over when coming on/off escalators, bumps or imperfections in the walking surface (the wheelbase is too narrow).  In addition I find the fully extended handle to be a tad short, I am a 5'8" male, so for anyone taller (and who isn't), the handle is too short. Folds up into a very compact package and fits in my briefcase or backpack.  I would buy again, if I couldn't find another lightweight cart like this one, but would prefer a wider wheelbase and longer handle.