Speaking of bags, thought I'd share my absolute favourite (along with a little how I use it). It's the Thule Subterra 25L Backpack, and I've missed using it since my uni converted
Thule Subterra 25L Daypack - YouTube
Thule Subterra Daypackシリーズ | Thule バッグ | 株式会社アスク
Thule Subterra Backpack 25L - Planet Bike East Brunswick Matawan / Old Bridge
Thule Subterra Daypack (25L) | This Thule laptop backpack is a commuter-inspired daypack with flexible capacity, quick-access compartments and dedicated protection for a 15" MacBook... | By Tripologie | Facebook