Magic Forums

I see pre-made charm bags at online Wicca supply sites. They don't say what is in it, other than general statements of containing the right items for the charm bag's purpose, such as:

"Our charm bags contain blends of gemstones, herbs, roots, and barks along with a small talisman spell. The contents of each bag are carefully selected with the particular intent of the bag in mind. The bags are charged, consecrated, and ready to use . . "

First, should we trust charm bags charged and consecrated by them?

Second, can I make my own?

I imagine that I could simply by gathering and using those stones, herbs, feathers, etc that are normally used for the same purpose I'm creating the charm bag for. I know I'd have to write my own spell also. Or is it more complicated than that?