The Water Cube™ refillable emergency storage solution can hold 2 1/2 gallons of water with a 5 year shelf when used with Water Preserver. The outer box design keeps the inner container safe from UV damage and punctures while allowing one to stack several filled boxes to save space.
The standard water storage requirements to follow are 1 gallon of water per person per day for drinking with an additional supply for cooking and hygiene. Small packs in your survival bag are enough to help you avoid dehydration but fall short when you factor in activities and heat or shelter in place survival. High volume storage, such as a 30 gallon container, are great for volume but are not ideal when facing an evacuation
Cache Outfitters recommends a combination approach to storing water for an emergency - keep a large amount stored for a shelter in place scenario and smaller containers that can be easily filled to be ready to go mobile.