I'm off to Big White in a few weeks with AC so this is what their website states: Skis (including poles):
- One or more sets of skis (snow or water) carried together in the same container count as one piece of checked baggage.
- Skis and poles must be packed in a rigid and/or hard shell case specifically designed for shipping. If otherwise packaged, the items will be accepted only with a signed limited release form.
- If carried separately, a set of ski poles will count as one piece of checked baggage.
- No oversize charge applies to skis. However, any overweight charges will apply
- See ski boot bag information below.
Ski or snowboard boot bag:
- One boot bag is permitted per passenger and will not count as a piece of checked baggage if:
- it is carried along with skis or snowboard and
- it contains only boots.
- A boot bag will count as a separate piece of checked baggage if:
- it contains - or is designed to contain - other items, or
- it is not carried along with a snowboard or set of skis.
EDIT: I think you can can have some gear in a a bona-fide boot bag. AC is trying to prevent someone calling a hockey bag a boot bag and stuffing it with more gear.