I received the survival water filter bottle system in exchange for my honest unbiased opinion. Its very handy and useful. Holds 23oz of water as well as filters it making any type of water drinkable. Great for the hiker who runs out of water or wants less to carry. Just fill in the river and drink. It filters the gross and dangerous stuff making your water fresh for drinking immediately without boiling. This bottle is leakproof allowing you to drink it then refill and take on your journey without worry. Has a strap and caribeaner so you can attach it worry free to your belt or backpack leaving your hands free to climb or whatever else you need them for. Very nice quality thick plastic.