In the thread, "Love Mojo Bag!", please look for my post.
It's a rather simple recipe, and can be tweaked to your needs.
Mojo bags, as with gris gris bags, can only be seen and touched by who created them.
If they're seen or touched by another, you would need to "bless" it once again, with any psalms/prayers/etc that you used.
I use pre-made bags, due to the nerve damage in my hands, preventing me from sewing.
Hell, you could use a sock.
Unless a store is centered around your practice, don't take the word of those within.
Kudos to you, for double-checking with us :D
~ Never Lost