These 1000-denier Cordura bags are durable and strong. An internal pocket seperates your tools and delicate items like tube or patch kit. Tail light clip on rear of bag Small - 6. 3" x 3. 3" x 3. 3" - 28 cu inch Medium - 7. 5" x 3. 7" x 3. 9" - 33 cu inch | Topeak | Aerowedge Pack Dx Seat Bag | Black | Small, W/ Fixer F25