Urgent question - roots organic bag size for super soil recipe

So I picked up several bags of roots organics last week and was getting ready to mix today... went to the hydro store this morning and saw even larger bags of roots than I got. So my question is, what size of bag in the super soil recipe does "large" equal??? My bags are 1.5 cubic feet bags. How many of these bags would be equivalent to one "large" bag for the recipe. I think I almost mixed my soil way too strong because I was going to mix full strength using these bags as 'large' bags when apparently they are not. Want to mix soon so lots of karma to the person/people who answer quickly

Looked like the bigger bags I saw were a cubic yard but I didn't check. Searching online I mainly find the 1.5 ft bags. So large = 1.5ft2 or 3ft2?

the bigger bag is not the standars Roots the 1.5 bags are what Subs talking about

Yep you are good to go 1.5 bags are the ones.

Cool thanks Minor freakout Supersoil here I come! Soon as I finish this bowl that is