The most important factors are size and weight
But my favorite detail

Product Details: Protection - Complete KOROYD coverage for lightweight, energy-absorbing, and ventilated impact protection - Mips Brain Protection System reduces rotational forces caused by angled impacts to the head - Integrated skeletal structure creates a roll cage for added strength and impact protection - NTA8776 E-bike, CPSC, CE EN 1078, and AS/NZS2063 certified Fit / Integration - Designed for ultimate integration with Smith performance eyewear and goggles for maximum comfort, venting, and storage convenience - AirEvac ventilation system integrates with Smith goggles and eyewear for fog-free lenses - VaporFit dial adjustment system offers 270-degree fit adjustment with the turn of a dial Features - 19 fixed vents for consistent airflow - Three-position adjustable visor - Ionic+ antimicrobial lining offers sweat-activated odor control - Lightweight, low-bulk single-layer webbing - Y-strap divider keeps helmet straps flat and close to the face - Front eyewear storage channels - Weight (Size M, Mips): 14 oz / 400 g $225.00 - $230.00 Whether you ride for routine fitness, focused training, or just for fun, the Smith Triad bike helmet has you covered on the road with advanced impact technology and tunable comfort

Tote bags have been a highly popular variety, given their large capacity and versatility
Measures 6" width x 6.5" height x 4" depth.
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