Haven't worn them but just found out about mini mil boots. Reviews on Amazon seem good.
http://www.amazon.com/Belleville-Tactical-Research-Mini-Mil-Athletic/dp/B00AMLEPI0
Edit: sorry, just realized you wanted a pull on boot; these lace up. =/
The Belleville Mini-Mil is probably the lightest boot there is. I love them. They're like running shoes.