I've looked around but can't seem to find out what the square ~handcuff size pouch is for. I've learned I'm missing the cleaning kit too, anyone have a lead on an oem replacement?

The cleaning kit can be found here.........

http://www.samsguns.com/cgi-bin/Store/store.cgi?cart_id=5967328.17603.s0&lastmenu=&product=CLEANING_SUPPLIES

It is on the bottom of the page.

I always find it interesting when people ask what that pocket is for.

It is for whatever you decide to use it for.  Some have used it for handcuffs I think, some use it for loose ammo, I use it as a muzzle cover for the USP with light/laser attached, etc, etc.  Use it for whatever you think should be in it.

The square case is for a tactical light such as the UTL Mark II.  It will fit a lot of things but I believe that is what it was originally intended for and the long tube was made for the suppressor.

Damn, they are sure proud of the HK case!  They usually go for about $26.  You use to be able to buy them from HK but since the new web store opened up they no longer have that particular kit listed.  They now only list a $54 kit, but a darned fine one it is.
HK also has a new pistol case on their web site for $28.75  It is much nicer than the promo cases that came with colored USPCs a few years back.  It has a pouch and slots for 5 magazines.

Yeah but WHO can afford 3 more mags?!?! haha jk Thanks for the reply, the light didn't cross my mind yet. Makes perfect sense now.

I've always wondered what that square case was for.  Intuitively, I stuck my UTL in it, but it seems to be sized for something even larger.  Maybe the Wilcox LAM?

It was made for the utl. But it does have a little room left over in it.