Fast, safe and easy ultralight gravity filter system with multi-vessel compatibility. The multi-compatible QuickDraw 3L Gravity Filter System is the most versatile ultralight gravity filter on the market. Able to convert from a gravity system to a squeeze setup when you want it, it can do it all with your preferred bottles and reservoirs. At the core of the system is the iconic fast-flowing hollow fiber QuickDraw Filter. The 3L dirty reservoir&';s hang handle makes for quick-and-easy hang-ups and is sized for comfortable carrying when it&';s full. The handle easily detaches to make compressing and rolling the reservoir down hassle-free when you opt for squeeze filtering. The QuickDraw filter can attach to many different bottles and reservoirs with its I/O (inner/outer) threads on the dirty side and the ConnectCap(TM) on the clean side. For added versatility, the system&';s hose is fitted with a quick connector that attaches to any hydration reservoir with a quick disconnect, as well as clicking into the QuickDraw&';s Bottle Adapter. The Bottle Adapter is multi-compatible and vented, meaning common hard-sided wide-mouth bottles and narrow-mouth bottles are all game to hold your freshly filtered water. The system is built to be safe, effortless, and long-lasting. Two cleaning methods-shake-to-clean and backflushing-keep the filter flowing fast throughout your trip, while the Integrity Check process allows you to ensure it&';s still safely filtering water. If there ever was one, the QuickDraw 3L Gravity Filter System is the one backcountry water filter that does it all. Combine & Customize: I/O threads, the ConnectCap(TM), quick connector-fitted hose, and the Bottle Adapter let you dial in your custom leak-free system using the clean and dirty vessels you prefer, like smartwaterA(R) bottles, Platy bottles, and quick disconnect-fitted hydration reservoirs. Premium 3L Reservoir: Proprietary tri-layer film dirty reservoir has a detachable hydrophobic hang handle, an easy-fill wide-mouth opening, and is super durable and packable-plus it&';s guaranteed plastic-taste-free. Ultralight: At just 8.2 oz (233 g), it supports larger groups with clean water without weighing you down. Fast Flowing: Hollow fibers filter 1.75 liters per minute in a gravity setup and 3 liters per minute with squeeze pressure. Easy Cleaning: Easily shake-to-clean the system or backflush it to keep the water flowing fast throughout your trip. Safe & Effective: Each filter is individually tested to ensure it meets all EPA & NSF guidelines for the removal of 99.9999% of bacteria and 99.9% of protozoa.* Integrity Test: Unlike other squeeze filters, easily determine if your filter has been compromised from a fall or freezing by performing a simple integrity test. Compatible Vessels: QuickDraw reservoirs, smartwaterA(R) bottles and other narrow-mouth 28mm bottles, Platy 2.0L, Platy SoftBottle(TM), Platy Water Tank, wide-mouth bottles like NalgeneA(R), Hydro FlaskA(R) and YetiA(R), quick disconnect-fitted hydration reservoirs like the Big Zip(TM) EVO. Comes with QuickDraw Filter, 3L QuickDraw dirty reservoir with cap, dirty-side cap, ConnectCap(TM) with cover, Bottle Adapter, backflush washer, hose with quick connector, shutoff clamp and storage bag. A) DIRTY SIDE: I/O threads directly attach to all QuickDraw Reservoirs, all Platy Bottles, and all common 28mm plastic bottles including smartwaterA(R)* bottles. B) CLEAN SIDE: ConnectCap directly attaches to all Platy Bottles and all common 28mm-thread plastic bottles including smartwaterA(R) bottles, and has ahose attachment point. C) HOSE: Quick connector pairs with any reservoir with a quick disconnect and attaches to the Bottle Adapter. D) BOTTLE ADAPTER: Wide-mouth and narrow-mouth bottle compatibility.