evo.com | BCA Snow Study Tools > Plan backcountry tours and record all of your important snowpack observations in the rugged BCA Field Book. Field / weather observation pages Compliant with the American Avalanche Association (AAA) SWAG standards Developed by the American Institute for Avalanche Research and Education (AIARE) Write in the rain all-weather paper Dimensions 7 x 4.5 in / 17.5 x 11.5 cm | BCA Field Book 2025 in Blue