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Backpack dimensions: 9W x 10H x 4.5D (Please note: width is measured across the bottom of the backpack

Arcane is made with 100% recycled materials.

GLOBAL BACKPACK MARKET SIZE, BY WORK & PROFESSIONAL, BY COUNTRY, 2018-2032 (USD MILLION) TABLE 98

My back's upright

Below is the formula, followed by the calculation for our specific case (assuming 60 RPM at the pedals): Spindle diameter = (PSWRPM pedals)/(WSRPM generator) PS = pedal sprocket diameter W = flywheel diameter RPM pedals = how fast you pedal WS = flywheel sprocket diameter RPM generator = the no-load RPM of the generator Spindle diameter for our configuration (in mm) to produce different voltages: 12V = (19052560)/(601700) = 58.68mm spindle diameter