Good Gas Mask and Respirator Satchels

I was asked if I could do a top 10 list of gas mask bags, but decided it would be better to look at some of the designs that exist that are good.
This includes bags designed to take canister filters with a hole to allow air to flow through the bag, as well as conventional satchel/haversack bags designed to store the mask when not in use.
Ideally the bag should be coated with a water-resistant layer, meaning chemicals and water can not get into the bag.
Many masks come with satchels but they can often be bought relatively cheap separately.
Respirator bags are often referred to simply as bags, satchels, carriers or haversacks.