1. Model 15.6inch: NO USB, with padlock
2. USB 15.6inch: with USB, with padlock
3. USB Upgrade: with USB, with padlock, with expandable structure
1. Selected splashproof high quality material
2. Anti theft double layers zipper, Anti theft free padlock
3. Large capacity, Earphone hole design
4. External USB charging port, only USB port, power bank not included
5. Expandable structure design: only "Upgrade" including
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