12 liter backpack

Rab Tygen Backpack - Lightweight Breathable Daypack for Travel, Hiking, & Commuting - Dark Pollen - 12-Liter (Back Length - Medium)

at Amazon Marketplace

Dakine 365 Pack Mini Backpack, 12 Liter, Strong Bag with iPad Compartment - Backpack for School, Office, University, Travel Daypack

at OnBuy

BANGE Travel Overnight Backpack,40-Liter FAA Flight Approved Weekender Bag Carry on Backpack…, Grey, 18.5Hx12.5Lx9.5W, Rucksack Backpacks

at Amazon.co.uk