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The more the body works to cool itself, the less energy it can spare to push the pedals

Weighing just 1 pound 2 ounces, its the lightest duffel weve tested, and it compresses down to about the size of a thick novel inside its included storage pouch (which can double as a packing cube)

The 2.5-liter bladder is housed in its dedicated sleeve inside the main compartment which keeps the wet stuff in its place, although not completely separating it from the rest of the pack in case of leaks or spills

You want an electric drive system that's so lightweight and efficient you almost won't notice it until you flip the switch for a strategic boost of power