DAY PACK 13 laptop size convertible by roughandtumblebags, $238.00
This looks fantastic, but probably too casual to wear to work..
Wholesale Sport Messenger Bag - Buy Women's Handbag Candy Color Backpack Vintage Bag Messenger Bag Fashion Folding Women's Handbag 170479, $39.58 | DHgate
Colourful yet stylish
Tweed, shower proof