Blackburn's Grid Seat Bag features tough, water-resistant materials and a water-resistant zipper to ensure the contents of the bag stay dry and protected. The retroreflective side panels substantially increase nighttime conspicuity for safe and effective visibility in the light of approaching cars’ headlamps. The small-sized Grid is big enough for a road tube, a multi-tool, 2 tire levers, a CO2 inflator, and a CO2 cartridge. The medium-sized Grid fits 2 road tubes, a multi-tool, 2 tire levers, a CO2 inflator, and a cartridge. The large-sized Grid features a removable internal organizing divider, and it’s big enough for a jacket or 3 road tubes, a multi-tool, 2 tire levers, a CO2 inflator, and a cartridge. FEATURES: Water-repellent, abrasion-resistant construction. Adjustable mounting system. Hook-and-loop attachment. Water-resistant zipper with ergonomic pulls. Retroreflective side panels. Tail light loop. Capacity: 0.45 L, 0.80 L, 1.4 L. Weight: 55g (small), 70g (medium), 130g (large).