Dual opening design - slider sealed wide opening and standard 42mm neck Attaches to filters with a 42mm thread, such as the Katadyn BeFree Easy to fill and simple to clean and dry due to the wide opening Durable with a breaking point of 220 lbs Tethered cap and slider Fresh, cool, filtered backcountry water just tastes better. The Vecto allows you to easily collect, store and treat water, using your filter of choice. The Vecto is light, durable and easy to handle. It is easy to fill with just a couple of scoops, carry to a dry camp or filter on the spot with a 42mm compatible filter, like the Katadyn BeFree. Leave more time to really enjoy your hike or just time at camp with a quick and simple filtering system. (NOTE: The product is not compatible with the Sawyer Squeeze or other 28mm thread filters)