Yes, you can double or triple the Ball recipe, but I wouldn't do more than that at one time (about 6 was the old standard with the boxed pectin). That's one thing they didn't make clear when they switched to the bulk containers from pre-measured boxes. We were always warned not to double batches, but they made a larger batch then!

You need to prepare your fruit per the instructions (i.e. mashed, diced or whatever), then measure.

You can always freeze them for later!

Deanna

I read it to say not to exceed 10 JARS. Yes, if you go to website, it will show you exact measurements for the 10 jars. Unfortunately that pectin jar will only make about 25 1/2 pint jars. I bought bulk pectin this year, but still use the Ball website. It's great, they ask for the fruit, whether jam/jelly, which pectin you want to use and it will give you the measurement for regular sugar, low sugar or no sugar.
Make sure you add the lemon juice or peaches don't want to jell.