I have a couple of bag organisers – one is a VIP, the other one is Coaban, and the third one is one of these. They do sell them on eBay and Amazon as Kloud City but I got my no-name version really cheap (about €6) on a local Swedish site, Fyndiq.
They are good for moving the vital contents from one bag into another, but you can also use them to keep planner or journal supplies all in one place and nice and tidy. You can then move them around the house with you, or pop them into a bag if you are going to a café etc.