What's the best kind of Diaper for a boy who is 48 pounds?

My son is 3 and he is 3'7'' and 48 pounds, Huggies overnites size 6 are getting to be too small for him. What would be the next best thing to protect him from leaks at bedtime? Thank you so much. PS-Huggies doesn't make a 7, oh how I wish they did!!! :)