Up until now I've always kept hay in the plastic bag it comes in. But I was talking to someone earlier who said this was really bad for the hay, that the plastic makes it go 'off' So what do you all keep your hay in? I've seen the cloth hay bag on the hay experts but it says it only holds 1-1.8kg of hay. My bags of hay are bigger than that. Would keeping the hay in a duvet cover be ok instead?