Swimrunners safety buoy features dual air bags, which are inflated once you have filled the bag with your gear. The inflation chambers are separate from the storage area, thus providing more buoyancy than just a normal dry bag. The adjustable dual belt design attaches securely around the swimmer's waist and the leash ensures that the product remains out of your stroke range whilst swimming. While running you can carry the safety buoy as a backpack, with the attachable shoulder straps. The 28L bag is highly recommended to all open water swimmers who might need to carry their kit when going for a swim, or anyone who wants that little bit of extra visibility to help keep them safe when out in the water. When the bag is lying flat the internal area of the bag measures 50 cm x 35 cm, leaving plenty of room to fit your towel, clothing & gels etc.