When I have more time and want to do something a bit larger on good watercolour paper, I cut paper to size, punch the proper holes in it and place these in a looseleaf binder. This makes for a lot of flexibility and gives you the kind of paper you want. If you are heavy on the pencil drawing be sure to give your work a good spray of fixatif. Here is the binder:
If you add looseleaf note paper to your binder it's great for making notes about your painting experience.