yes, it will definately hold a pair of boots, your snowsuit and a lock... just make sure you only have one board with bindings in it. i haven't tried putting a helmet in it but i'm sure you can fit it inside or if all else fails just clip it onto the shoulder strap!
great snowboard bag! awesome to carry around when traveling and it fits all the stuff you need to take to the mountain or when flying to your final pow destination! also, it's a great storage bag for off season as it fits my board, bindings, and several snowsuits!