Review on humangear capCAP+: The Ultimate Blue Bottle Cap for All Your Hydration Needs by David Herman

I love this top with one caveat. I use it with Nalgene 32oz wide mouth bottles. It works great with plain water, but if you have to shake the bottle to get a smooth mix in your drink, it won't leak and the liquid will get into the cap and drip when you slide it to the side and/or the hook . it's to his little hook. I've used it with some things I take in the afternoon and it had to be shaken and each time moisture got stuck in the cap which then seeped into my hand and also into the bottle. This can happen with any cap, but this surprised me. Now I only use my Nalgene for water, which is fine, but I'd love to use it for more. It's not a huge issue when you're on foot, but it's a mess in a car and rather negates the usefulness of the strap's cap-holder notch. Nearly perfect.