The only way to organise clutter is to get rid of it.
These are my favourite tool to do that.
I was using garbage bags, but they tore, fell over, and basically annoyed me.
Plus they are B.A.D. for the environment.
These are a great solution. Pop up laundry baskets. They are light. They fold down to nothing to store easily. Plus - you can play Australia's national sport, and take potshots at the bin for a bit more entertainment.
The ones I use are from flylady. But you can get cheap pop up laundry baskets at your nearest "$2 shop", or in the laundry or toy departments of big W, Kmart etc.
Makes organising SO MUCH easier!