What main features should I look for In wheeled garden leaf and litter vacuums?

McCulloch M4076 Wheeled Lawn & Leaf Vacuum

 

 

 

•  Powerful engines up to 160cc and above producing very powerful suction

 

•  A large collection bag (from 180 litres upwards)

 

•  Easy to manoeuvre and control

 

•  Easy to start

•  Smooth running wheels