I have been very pleased with the pants I bought from Checkpoint Charlie Survival Supply (current supplier, originally Drop Zone Tactical). Better BDU and 3G OPS Pants.

Two varieties with somewhat different design features and different weight fabrics (12 oz and 6 oz, if memory serves). Double knee and double butt, pocket fabric same as pant fabric. Plenty of pockets, even more in the 3G OPS Pants.

They are, however, breathtakingly expensive. Quite a bit more now than when I bought them a few years ago. When looking at the prices remember that they are in Canadian dollars.

http://www.checkpointcharliesurvivalsupply.com/cart.php?target=category&category_id=249