Costco has updated their rules about mask wearing in the warehouses, from what I hear this is Canada wide and I have seen similar information on American websites also.
Signs are up in Winnipeg locations and the new rule starts on the 16th.
Everyone will now need to wear a face covering – no more exemptions or excuses. If you’re unable to wear a face mask due to a medical condition, you will need to wear a face shield. The only ones not needing to wear one are children under 2.
They are also asking that people limit the number of Shoppers going in, keep it at 1 for those who can. Of course not everyone can, but even just keeping it to smaller numbers helps. Setting up a grocery co-op is a great option too.