A more environmentally friendly option to disposable bags! It is made from several materials, including cotton, and it has a volume of 14 litres.
From Amazon
Fjallraven 24203-410 Totepack No. 1 Sports backpack Unisex Mesa Purple Size One Size
Scandinavian Outdoor Store
Fjällräven Totepack No. 1
This product is also available at 1 unverified store.