As noted above, probably the best way to test gear sacks is to turn them inside out, then fill them with water
This kind of backpack is suitable for carrying a laptop, a tablet, a wallet, a cosmetic bag, headphones, a food container, a bottle of water, an umbrella, a sweater, or a jacket
The reason for this variety in testing is to make sure that the helmet tightening/ratchet system doesn't interfere with the arms of the sunglasses, there is enough room between ear and helmet for the glasses, and that the glasses can be easily stored in the vents of the helmet
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Express W Trek 4 Days Short on time