They don't call it "ballistic" nylon for nothing. The Timbuk2 Seat Pack XT is just about bullet proof. It's a medium-sized, weather proof, reflective seat pack for riders who don't want to be weighed down, who want to have quick, convenient access to all their stuff, and also want to be seen by motorists.
Built from rugged ballistic nylon construction with waterproof nylon accents
Medium-sized saddle pack holds small essentials such as ID, energy gels, keys and small tools; wide zippered opening provides easy access
Secures to bike seat with adjustable side-release buckle; front bungee secures pack to seat tube
Timbuk2 Seat Pack XT saddle pack features a reflective rear panel that doubles as an attachment point for bike lights