2oz is the perfect size for my diaper bag. We buy the bigger 4 oz tubes locally but needed travel size. We have only gone through two large tubes so far and my baby is almost 7 months. She would get baddddd diaper rash as a newborn. We used Destin (every color you can imagine) and Aquaphor with every diaper change but it didn't work.
I was at CVS desperately reading ingredients on different products. This Butt Paste (red kind) had the most active ingredient (40% zinc oxide)! It also had the least number of total ingredients. It was by luck that I found it. It was the last one on the very lowest shelf. This is all we use ever since.
If baby is a little red, we apply to her butt and bits and she isnt red the next diaper change. Most of it wipes into the diaper as she wears it, but a tiny bit gets caught in the folds. It easily wipes the next diaper change and I never reapply.
Don't get it on clothes or sheets. Just put a little bit on your finger, apply, and wipe your finger clean on the inside of the diaper. No need for butt spatulas.
From left to right, I have the 2 oz cardboard box, the 2 oz bottle, and the 4 oz bottle. That's a measuring tape in inches to help you compare sizes.