You can impregnate your backpack at the beginning and the vegan tech material can be treated very well with a leather care product. When buying waterproofing spray, please make sure that it is suitable for tex-materials and that you keep the necessary distance when applying it.
Caution: For any damage caused by waterproofing, the warranty does not apply! It is best to test the spray first on an inconspicuous area of the product.
Coarse dirt and stains on the vegan tech material are best removed with a little warm water and mild soap or a dirt eraser. Stains in the fabric can also be removed well with a mild shampoo. Please do not wash your backpack in the washing machine or with dry cleaning products.