The PT-15 holds 50% more air than the PT-10. This is nice when you only have room or the budget for one tank. The added capacity is more economical since the fill cost is the same as filling the 10 lb. size. And at 36 lb., it's still very easily portable. This tank is just 30" tall including the handle.
Dim: 7" dia. x 30" Ht., 36 lb. wt. full