Positioned for minimum wind resistance and easy access. These bags are ideal for triathletes or riders wanting to keep energy food or other small items close at hand. Three models: mesh cover, rain cover or fully waterproof DryBag Internal compartments keep items separated Simple velcro strap fixing Mesh Cover:- Small: 14x4x10.2cm, 0.6L, 59g Large: 18x10.2x4cm, 0.72L, 72g All-Weather:- Small: 14x4x10.2cm, 0.6L, 65g Large: 18x10.2x4cm, 0.72L, 80g DryBag:- Small: 14.5x4.7x12.8cm, 0.6L, 65g Large: 18x12.8x4.7cm, 0.72L, 120g Note: Sand, dirt, mud, etc., and bags that are incorrectly pack may cause the bike frame paint in contact areas become dull or scratched over time. To avoid any potential damage, you should protect the frame or rack with foam covering or protective film before attaching bags or panniers.