What I think students should have in their school bag (high school and college) as essential materials.
1. Laptop or Tablet and charger - depends on student needs, school policies, etc.
2. Notetaking app - Evernote, Simplenote, etc.
3. Cloud file service - ok, not in bag, but a must have to backup and access files
4. Flash drive for backup
5. Smartphone and Charger. Apps: Evernote, Cloud file service, calculator, LMS app for their school, etc.
6. Pen and pencil and eraser
7. Notepad
8. 3-ring binder for paper notes and handouts
9. Mini stapler
10. Hole punch to put papers into binder
What would you include?
Related:
My Favorite Resources for Educators and Students
Notetaking Apps - a comparison of some of the popular ones