Got stuck in powder once. Not pleasant. Almost lost my wallet because I forgot to zip my pockets so when you ride don't forget to zip/velcro everything!!
Last season was my first chance to ride real powder and on my first day accidently left my jacket pockets open. At about mid-day I noticed it felt like I was carrying 10 pounds of change in each pocket, reached in and noticed my pockets were STUFFED with packed snow.