Hi!
My experiences with Tasmanian Tiger -TT Tool Pocket pouches are very good. I used the S-model as a knive pouch as well as magazine pouch. Mybe the M- or L-model is worth to be looked at in your case. Check it out here: http://intranet.tatonka.com/infosys/php/artintt9.php?7695_TT Tool Pocket L
I don't remember how big the TA20 is, but I bought a Condor brand MOLLE pouch from Amazon.com. It fits loosely on two rows and tightly on three rows. It uses a snap to fasten the straps and was a little difficult to fasten. I use it for a Olight M20X-S, the previous generation. It has a velcro strap that leaves the top 2 inches of the flashlight sticking out. Here is a link to it: http://www.amazon.com/gp/product/B0050JYJ1M/?tag=cpf0b6-20
Check out 5.11. LA Police Gear is a good place to find there stuff. I have a VISM Shooters Gear Sling bag that came with two single MOLLE pistol mag pouches and one double MOLLE rifle mag pouch. The single pouch is just the right size for my LF Seraph 6.