The Frontier Ultralight Collapsible Pour Over folds flat for storage in its polypropylene mount base, then pops out when needed to make a perfect pour-over brew. The easy-to-clean stainless steel mesh filter is sized just right for one serving (approx. 30g) of ground coffee and formed to hold the grounds but filter the coffee oils for a rich, satisfying cup of coffee.The mount base fits most mugs and wide-mouth bottle rims, and the EU food-grade silicone rubber and stainless steel filter unit slides inside the base for easy transport. It even stows nicely in a Frontier Collapsible Kettle.