An ultra compact weatherproof seat bag Features a built in anti slip strap to store extra gear on the outside of the pack Topeak's Rail Wing system securely attaches the bag while also allowing for access when attached This item contains Per and Polyfluoroalkyl Substances (PFAS), therefore is barred for sale into the State of California under the California Safer Clothes and Textiles Act which takes effect January 1, 2025