I know I am completely obsessed with these SIGG bottles but I kind of have them on my hips 24/7 (so to speak). If I had known about these sleeves earlier, I could have avoided all the dents in them. And there is a clip on them to hang off of your bag, stroller or whatever. Very nifty and absolutely essential. Also hurts less when your tots accidentally hits you with the bottles (yes, I have a bruise to prove it!). Neoprene Kids Pouch for SIGG Bottles, $7.99 for the .3 liter and $12.50 for the .4 liter size bottles at Amazon.