Restrap City Stem Bag 1L Black. The 1 Liter Restrap City Stem Bag fits any folding bicycle. Made from tough waterproof fabrics it provides a simple solution for carrying a water bottle snacks or other accessories. The bag moves with the stem and does not impact the folding mechanism of the bike. Hand made in Yorkshire all bags are finished with the classic Restrap label made from vegan-friendly PU.