After you crash your car, but before you decide you'd be better off getting around by bike, you might consider ripping out the now-spent airbags and making them into a tough and light duffel bag.
Or you could skip the whole crashing business altogether (although you should still ditch the car) and just buy one of E13's SRS Day Bags.
The bags are made from "upcycled" airbags which have popped their last. The resulting Day Bag looks like a skinny duffel, and has a detachable shoulder strap which gets its own pocket to stow it when you don't need it. In fact, pretty much every part comes from a dead car: The outer layer is a driver-side airbag, the lining is from the passenger-side bag, and the handle and strap are recycled seat belts.
Capacity is six liters, the length 17.5 inches and the diameter 6.25 inches. There's also an 8 x 5-inch pocket inside.
For a recycled bag, it's pricey at $120, but then again, think about what you're now saving on gas since you swapped your car for a bike.
Day Bag product page [E13 via Core77]
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