Use Finisterre Natilus Backpack (23L) in discontinued yellow color. Nothing wrong with the bag, just don't use it anymore. Below is the description from Finisterre.
The Nautilus roll-top backpack is purpose built for all your daily adventures. Loaded with features and handy compartments, it's durably constructed and weatherproof treated. And with a 23L capacity it has stacks of room for all your essentials - taking you from work to the weekend and back again.