If you're going hiking, this is a suitable backpack. Maybe not a good choice if you prefer lots of colour choices, but it does come in black.
From OnBuy
MILLET - Ubic 40 - Backpack for Men and Women - Hiking and Trekking - Medium Volume 40 L - Black
Trekkinn
Millet Ubic 40l Backpack Black
Hardloop
Millet Ubic 40 - Hiking backpack Black / Noir 40 L