Evo is one of my favorite shops for snowboard gear, with great descriptions on the site plus staff who have real-life experience with the gear, and can suggest options for your style and skill level.
Snowboards | evo
The Dakine Heli Pro has been my go-to backpack for snowboarding for years, with space for snacks, layers and a hydration bladder.
Dakine Heli Pro 24L Backpack - Women's
Salomon snowboard boots have been my favorite since I started. Durable, with great support for long days on the snow.