Flip the bag over and look at the ingredients, its mostly just peat moss with a lil perlite and compost
Wanna make something better for cheaper per gallon?
Here’s my economical soil building and instead of loading it all down with peat and getting frustrated come watering days watching it all bead and run off you can use coir instead for water retention and ditch the peat
One helpful piece of info when looking at the size bags of ingredients or ready soil is that 1 cu ft equals 6.4 gallons, so a typical 1.5 cu ft bag is 9.6 gallons