23.7 ounce hard sided water filter bottle with 1 filter. Design may vary.;1 water filter can replace 300 standard 16.9 ounce water bottles;Filter sits inside water bottle, reducing particulates and chlorine taste and odor, often found in tap water;Durable BPA free water bottle features carrying loop, easy-sip straw and is top rack dishwasher safe;Replace filter every 2 months with black Brita Bottle Replacement Filter item number 60258 35818