Passed as free personal item on Spirit - they did ask me to slip it in the measuring box.  Probably would not have made it had I packed anything in the outside pocket.  The handle is a bit janky and I doubt if it will last another trip without breaking.  For the money - it is worth it.  For those frequent no frill flyers - prolly best to invest in something of higher quality.  This was a quick 3 day trip to the beach so not many clothes were needed.  I was able to pack 3 days of clothes for myself and a 3 year old, plus toiletries.  So, I'd say I packed two outfits per day for my baby along with 3 swimsuits, for myself - a pair of shorts, 3 bathing suits, one cover up, 3 tops, a jumpsuit and a pair of sandals (wore jeans on the plane).  And, a textbook.  All packed in vacuum space saver bags.