I have a Pathfinder stainless canteen from Self Reliance Outfitters and love it. Being stainless, you can use it to boil if needed. Nice wide mouth and holds a lot of water. Not ideal for carry on a belt due to the size and weight vs. GI or Nalgene versions but it works well on a pack or with a shoulder strap and is one of my favorite pieces of backpacking kit.