Already have an account? Photo: Courtesy It’s been raining for a few hours. First a light drizzle, then a downpour. Now, shivering, you finally decide it’s time to stop playing chicken and put on that rain shell. You wipe a wet tendril of hair from your eyes and bend to open your pack—only to have your daydreams of dry layers shattered by the sloshy sight of all your clothes, totally waterlogged. Alternative option: Invest in one of these waterproof daypacks before the forecast starts to slide. With taped teams, waterproof zippers, and impenetrable coatings standing between you and the...