If I were in your shoes, I would get Coussin in Camel first. Then at the 3 months point from now, see if I still want the black. My rationale is similar above. Camel is special colour, if I wait any longer I may not find it available by the time I want it.
It’s a new design for you, might be safer to get one first, try it out, see if it suits you. If you love it, no harm getting the black one later (but before 3 months from now, in case they decide to have a PI again) since black is the classic colour that’s always available. Should you find the bag not to your liking, at least you only need to return one bag not two.