Six gentle steps to hand-clean a fabric backpack
Victorinox recommends checking the care label, emptying pockets, gently hand-cleaning fabric, and air-drying in the shade.
Victorinox official guide to washing and drying a fabric backpack
Link to original backpack care instructions
Open source ↗Leather trim, coated fabric, electronics, and internal frames can make soaking inappropriate; follow the specific model's care label first.