Been only using this for about two weeks. The wheels don't seem as stable as I would like. And the wheels always seem to go first. Space is fine, old bag held more. I use my bag 5 days a week, dragging it in out of hospitals for work. It does get a work out, but mainly level surfaces and not very much weather. It does not seem as good as I was hoping it would be. I average 1-2 bags a year for the past 10 years so I probably have tried them all. Don't think this bag will be any different. Hope I am wrong.