Unstopables are sold as in‑wash scent booster beads designed for use in washing machines, including High Efficiency (HE) machines.
Listings show sizes ranging from 12.2 ounces up to 26.5 ounces, with common sizes including 12.2 oz, 18.2 oz, 21.1 oz, and 26.5 oz.
Instructions advise tossing the beads into the washer drum before adding fabrics, then running the cycle; you can add more or fewer beads to achieve your preferred level of fragrance.
Product copy and customer reviews report a wide range of longevity — from a single day of noticeable freshness to several days, and in some cases up to about a week. Results appear to vary by scent, usage amount, and user experience.
Listings and reviews mention using the beads on clothes, towels, bedding, inside drawers, and as room or closet fresheners in addition to adding them to washing machine loads.