Rocket Grips come in pairs.
 
Designed to make it easy to lift a pot without handles. Rocket grip will lift 25 to 45 litre Rocket Pots® safely and easily as the clamps fit easily on to the cusps, but will also fit onto conventional curved containers.  
The original design was to enable two people to lift a 25 kg 45 litre pot, within the requirements of occupational health and safety regulations.  Four people using four grips can lift a 93 litre pot.