50 sheets
Umriox 5PCS A3 Zipper Bags, Extra Black 5pcs, Thickened A3, Black, White
A nice touch is the black labeling that stays readable without being distracting.
24pcs Mesh Zipper Pouch File Bags Puzzle Storage Bags, A4 13.5x9.5 Inches
This unbranded component is a no-nonsense solution for basic needs.