what is the difference between the previous design and the current one?

We recently did a refresh of the color range for the Note Sleeve and also added RFID to all current colors. The difference between the previous design and current is the internal color of the leather along with the addition of RFID protection. If you're looking at a previous design there won't be RFID included unless mentioned in the description. Let us know if you have any other questions

How many cash bills will this realistically hold and still easily pull cash out and put back in?

I currently hold about 7 cards total in the wallet and kept 15 total bills in it comfortably. I felt that there was still plenty of room for more without feeling crowded.

Can you put more than one card in the front slots? Or is there only room for one in each,and the rest will have to go in the inside pull out slot?

Yep. I have 2-3 cards in each slot. The inside spot has a bulk of my smaller stuff. The inside spot is a little more snug so expect to mostly fit business card sized things there.

Why it doesn’t have an ID slot?

We do not include a specific ID slot in our Bellroy wallets. The Note Sleeve has 3 quick-access slots for your 3 most frequently used cards, any of which would be perfect for your ID, and the internal pull tab pocket for cards used less frequently.