I was going a little googling tonight and ran across a bunch of russian ration information. It's amazing what you can find when you actually search in Russian...I don't know why I didn't try that before. Just google for "Индивидуальный рацион питания" (Individual Food Ration) and you'll find a bunch of stuff.
Here's a pic from a company that appears to sell the older IRP-B style rations as camping rations:
From: http://npkversia.oml.ru/product,16799
All this search came about because of this Russian Ration thread over in the forums.