As requested, here is my custom A5, multiple elastic, TN cover from ImperfectlyPerfekt on Etsy.
It is really big but not heavy. In total it holds (with PLENTY of space to spare)
- 12 grid notebooks
- 2 lined notebook
- 1 blank notebook
- 3 plastic pouches
- 6 kraft folders
- all my pens, erasers, stencils, papers, stamps