A backpack such as this one can be very useful for a number of things. Since it only comes in black, your colour choice is made very easy and it has a volume of 80 litres.
From Osprey Europe
Farpoint™ 80 Travel Pack - Black - One Size
Trekkinn
Osprey Farpoint 80l Backpack Black
Hardloop
Osprey Farpoint 80 - Travel backpack Black 80 L