Reliance Rhino-Pak Heavy Duty Container The Rhino-Pak is made of extremely thick plastic, and has a premium spigot and vent cap. It features a side panel design that locks it in place when paired with another Rhino-Pak; locks together upright and on its side. Strap it down on your ATV rack and go exploring; tie it down to your raft and take on the white water; or simply slide it in your car and go on an adventure. Puncture resistant stackable and leak proof. 3.0 lbs Capacity 5.5 gallons.