Surprised by how big this was, they fill it to the brim and it's definitely a lot more than 60ml. Both the PG and VG work great with the flavorings they have on the site and I can make tons of nicotine free liquid with these. The VG is a little sweeter which works great when I'm making my dessert liquids (I feel like I'm puffing on a cake sometimes, lol, great for my diet!) and it's a bit thicker but both make clouds of vapor. Can't beat it for the price. Don't forget to order an eyedropper bottle if you're making your own liquids, it makes mixing and filling your cartridges a ton easier. (Posted on 3/6/12)