I'll be showing you how I made a fitted net to carry a nalgene bottle or other jar/bottle/item.
using the lid loop on the canteen works, but I have had several break after a while, and then I am doomed to loose the lid.
The net gives you multiple attachment options and offers some protection against rubbing.
I based my design on the instructions found here: http://www.knifeforums.com/forums/showtopic.php?tid/771863/hl/tutorial/tp/1/
I used a different knot for the bottom, in hopes of keeping the canteen more stable, but its still pretty wobbly.
Step 1: Gather the Supplies
1 Nalgene bottle (mine is extra awesome because I found it on the ground in La Grange TX)
2 Pieces of Paracord - 4 Armspan* piece and a one Armspan* piece
Lighter to prevent fraying.
Knot book - optional but I always like to have it nearby when working with rope.
*My Armspan is about 6 feet, if yours is significantly larger or smaller add or remove armspans to compensate.