The bags are made of leather, mainly cowshide leather. For this, the brand buys leather through wholesaled surplus lots. These are leather surpluses from other producers and brands that are collected and sold. This allows O*olga korstanje to buy quality leather at an affordable price, but in doing so, the origin of the material cannot be traced.
The bag brand uses different types of cowhide leather. One of these types is chrome-tanned leather, which uses a tanning process involving chemicals and heavy metals. This strong and supple leather is more resistant to scratches or other signs of use.
In addition, O* olga korstanje also uses vegetal-tanned leather. This leather was processed with vegetable tanning agents, e.g. from tree bark, without chemicals. This sustainable leather often comes with a higher cost and the range of colours is more limited.
Finally, Olga Korstanje chooses not to use a lining in several designs. This makes the bags easier to repair and limits the number of materials in a design. When a lining is needed after all, the brand opts for cotton.