20oz Straight Matte White Sublimation Tumbler

20oz straight Matte white blank sublimation tumbler 

I use the dimensions of 8.3x9.4 for all of my 20oz skinny tumblers because I prefer my image slightly larger than the cup. 
Some people use the dimensions 8.2x9.3 it’s a personal preference if you’d like a little room or not. 

I personally use my confection setting at 365 for 6 minutes. All ovens are different so you should check as you go for the best results