It's a replacement cap for a camelbak bottle, so I'm sure you're already familiar with the product, just replacing it because you lost the other or it broke, it's a great product at a good price from moosejaw as always.
If you're headed into colder climes, replace the straw flip top cap w/ this cap...the rubber nipple on the flip top version will freeze and leaks the slightest bit. This doesn't leak and fits either your camelbak or nalgene bottle. Only word of warning...tie a parachute cord to it so you don't drop it down the side of the mountain and have to buy a new one!
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