In Illinois we have kind of an odd situation, where we had the FOID Act, which allows you to "transport" a firearm, unloaded, in a case or container, and we have court decision that codified a fanny pack as a "case". We also have a concealed carry law now, but there are a long list of prohibited places, like libraries and any place that posts a ILCS 430 compliant "no guns" sign.
So the odd situation that arises from this is that I am not able to walk into a library with my Rohrbaugh in my pocket. I could however, unload the R9 in the car and put it in a pack ( like the 5.11 Select Carry Pistol Pouch), and then go to the library.
Well the loading and unloading is really bothersome, and I am thinking of getting a Kahr CM9 to just keep unloaded in a pack, and for those times when I can't carry, I'll leave my loaded R9 in its holster and lock it in the car, and just strap on the pack with the unloaded CM9 (you can transport loaded magazines with the gun, they just can't be in the gun's magazine well, if you had a revolver, the cylinder would have to be empty).
When I set out to buy a pocket pistol, I wanted the smallest, lightest reliable pocket pistol I could get. The R9 isn't the lightest, but the DB9 which is lighter, had a bad habit, IMO, of blowing apart. They've since added a third pin to the gun which supposedly corrects this problem, but they've also changed the ammo recommendation on the DB9 to less than 125gr bullets - and I like the 147gr bullets for SD. The other gun that was lighter than the R9 was the Kel-Tec PF-9, which was too big for pocket carry IMO. If I had the money and the Rohrbaugh brothers were currently making R9s - I'd buy another R9. But I don't have the money to buy another R9.
Also, the size and weight isn't quite as important for carrying in a pack as it is for pocket carry, and actually the must important thing is reliability, price, size and weight, and a trigger that is similar to the R9.
I've tried the SCCY - horrible trigger and not very thin.
I am looking at a Kahr CM9 - they can be had right now for $320.00
I used to hear great things about the CM9 but lately I have been hearing about problems with the tiny Kahrs - the CM9 and the CW380 and P380. Problems with QC - the magazine followers getting broken by the feed ramp, and problems with CS - not being able to get in touch with a person, Kahr not responding to e-mails...