I use a 2:1 ratio of the products down below to create my soil. (50% top soil, 25% perlite, 25% Orcid bark). I also occasionally add things like moss or horticulture charcoal. This mix can be made in any size as long as the ratio is the same.
These are just as good as my home made but are cheaper for one time needs or smaller plant collections.
I use these with my new propagation plants and for plants inside decorative pots.