These adapters allow you to create an inline hydration pack filtration system with the 0.1 micron screw on/off filter that comes with the Sawyer Squeeze Water Filter or the All in One Filter. Components weigh 1 ounce. Reconnect your drink tube with the adapters if you wish to remove the inline filter. Screws right onto the Sawyer Squeeze filter and can be inserted into your hydration pack drink tube. Works with SP131 Sawyer Squeeze and SP181 Sawyer All in One filters. weight: 1 oz.