To wash the entire backpack, it is safest to pull the inside out (pulling the bottom from the inside) and clean the outside with the sponge soaked in soapy water.
If you can be sure that the backpack will have time to dry properly, you can fully soap it and rinse it with water.
We advise against washing the backpacks in the washing machine because, despite the waterproof material, with prolonged full immersion, moisture could penetrate through the seams and it would be difficult to dry the backpack properly.
Special loops with straps are attached to the bottom of the backpack. For everyday use, these straps can be easily pulled out - they will be useful for larger trips when you need to attach something to the bottom of the backpack.