The XL DOES NOT FIT FRONTIER SIZER! Just a fair warning! Fits in one kind of Spirit personal item baggage sizer, but there’s another kind that I only see a few of, much less common, only seeing them at some gates not at the counter/baggage check, that runs a bit smaller that I suspect may give this some problems, but with traveling with three young kids in car seats, strollers, their personal item bags, and trying to race to baggage claim before my luggage was taken, I couldn’t try it out. It doesn’t do well with a personal item backpack on top/on the handle because it throws off the balance and is constantly tipping over. Only red and blue was left when I finally had the money to get this, which had me bummed because I really wanted the XL in pink or black, so while it’s a nice looking bag, I’m not too fond of the red color. Handle is a little wobbly/jiggly, but not any worse than any other bag I’ve tried in the price range. Seems pretty darn well made for such a cheap piece of luggage. Rolls smoothly without another bag on top of it. Can hold a staggering amount for the size if you use vacuum bags and pack smart. Make sure you have the wheels popped off before getting in line to board! Be careful when putting the wheels on to avoid pinching your fingers, because these are strong mechanisms to hold the wheels on very well, so you’re going to get a nasty bruise and/or blister if you’re not careful! The lock works okay, haven’t had any issues. Weight isn’t an issue with it being spinner luggage.