The nylon/elastic purse holsters that most manufacturers include with the bags are a place to start, but they will not be a good fit for many guns.
Your gun won't "snap in" - these holsters have zero retention. If you tip the holster upside down, the gun will slip out. We strongly recommend getting a kydex purse holster that's molded for your specific gun model, with snap-in retention.
You'll get several loose adhesive velcro sheets with it, so you can attach it however you prefer inside your bag (or any surface).
I like a bigger bag and am extremely pleased with this bag. Love the color as it's so rich. I was worried it migh scratch easy but I've been using it for a few weeks and it looks brand new. The zippers to access your gun are nice and large for easy access. I love the extra compartment and the padded place for your tablet. The only negative I have is it comes with a very flimsy Velcro gun holder. You will need to find something more secure as with most cc purses. I would highly recommend this purse. Thinking about getting it in black as well. Athena is very helpful if you happen to call her.