evo.com | BCA Snow Study Tools > Plan backcountry tours and record all of your important snowpack observations in the rugged BCA Field Book. Dimensions 7 x 4.5 in / 17.5 x 11.5 cm Compliant with the American Avalanche Association (AAA) SWAG standards Field / weather observation pages Write in the rain all-weather paper Developed by the American Institute for Avalanche Research and Education (AIARE) | BCA Field Book 2026 in Blue