One of the things that are a pain, especially when it's cold, is getting your nesting cup out of a bottle carrier like the Maxped 10x4. I think once you put some other things on the sides it tightens up the inside. This will work for a canteen cup and the old pouches too.
Get yourself a thin piece of cloth. A bandana works great for this.
Before putting your cup in the carrier put it on to of the cloth and wrap the sides up and into the cup.
Put your bottle or canteen in the cup to hold it all together and put it in the carrier.
Now when you want your cup you just need to grab the sides of the cloth and pull. Plus you got a cloth for other things.