A backpack such as this one can be very useful for a number of things. This bag is made from nylon and it holds 52 litres.
From Amazon
Osprey Ariel 55 Women's Backpacking Pack Ceramic Blue - XS/S
GearFreak.uk
Osprey - Ariel 55 Women's Hiking Backpack (55L) XS / Small Blue
Trekkinn
Osprey Ariel 55l Backpack Blue XS-S