Check out these features:-
Size:4.7x11.0in - 12cmx28cm
How about this? It can be used as lifebelt in emergency.
You can put in food, clothes, wallet and other personal belongings - just make sure it's empty before you add the water!
It can be compressed, and is convenient to carry.
Suitable for camping, rafting, hiking and other outdoor activities. Also a container that can be carried as an emergency supply of water.
1 PC Dry Bag