I've been using the small Transit trunk bag from Performance for 3-1/2 years, and it doesn't owe me anything, but still looks like it has a few years left in it. I have it permanently loaded with all the necessities for distance riding - pump, patch kit, tools, waterproof covers for my panniers & handlebar bag, spare tubes, removable headlamp & taillamp, & folding spare tires (700C & 27"). I move the bag & contents from bike to bike in my fleet as I go through the rota.