The Osprey Arcane Large 20L Day Backpack hauls it all when commuting to work, school, or just riding the bike to pick up odds and ends at the grocery store. The 20-liter capacity provides enough room for books, lunch and an extra hoodie in case the weather turns later in the day. A 15-inch laptop sleeve also adds a secure location to keep a computer stored during a bumpy bike ride to class, and the waxed canvas material withstands light rain when ducking into work when the rain begins to pick up.