The Filter-in Coffee Bottle is a very simple immersion system. It’s a glass bottle with a removable rubber lid, into which a filter basket is attached. That allows you to submerge coffee grounds for a period of time of your choosing (somewhere between 8 & 24 hours) and remove them quickly and easily when your extraction is finished. It can brew on the counter or sit in a fridge door, and once you’ve removed the coffee, it also serves as a sealed storage container and server for your cold brew!