We are going to Disney next week and since we will be walking around all day in the Florida heat I figured it was a good idea to have water bottles with us. But I don't want to be taking the bottles out of our backpack every five minutes when the kids want them, so I made each of them their own water bottle sling thing.
You want two of these pieces, one for the lining and one for the outside.
Next, I cut two circles for the bottom of the sling. I have a small ironing board thing with circles already on it and I used that. This wound up making my circles too big when it came time to sew, so I suggest tracing around the bottom of your water bottle, adding a seam to the outer edge of the circle and then cutting.
Turn one of your tubes right side out and slide your bottle in. Fold the edge toward the inside of the sling and adjust it to the height you want it. Now take the other tube, which is wrong side out and slip it inside the outer tube.
Fold the edge down toward the outside of the sling, and then fold in half back under itself. It should look something like this, your lining will be nice and neat on the outside of your sling:
Next cut two strips of fabric, cording, ribbon, whatever you like as the strap. For two of mine I cut two strips of fabric about 1 1/2" wide, sewed those right sides together, flipped right side out and attached. For my son's I used a piece of parachute cording. Attach the straps making them the length you'd like.
A note, learn from my mistakes: If I'd been smarter I would have used some d-rings so that the straps would be adjustable and grow with the kids.
As it is, I think they turned out pretty nice and I'll be glad we have them when we're walking around the parks.