So, I saw a hiker with Nalgene bottles on the trail this weekend. I too use Nalgene bottles and use duct tape to secure rope around it so that I can carabiner it to the outside of my pack. So, when I saw this hiker's Nalgene bottles dangling from his pack by rope, I was intrigued when I didn't see the duct tape. Instead, he had this fancy looking knot around the neck of the bottle. There were actually two knots on each side and the string looped over the mouth of the Nalgene. He said he couldn't remember how he tied the knot because he did it so long ago (a good thing, I guess - shows the durability of the knot!!). So, I thought I would post here and see if anyone knows how to tie the knot or knows where I could learn. I got a picture of the knot, and will upload it if I don't get any responses. Thanks in advance!