Einhell offers this lawn mower that can collect as much as 80 litres of grass in its collection box.
From Machine Mart
Einhell Einhell GC-PM 56/2 S HW 56cm Self Propelled Petrol Lawnmower
Comet
Einhell GC-PM 56/2 S HW lawn mower Walk behind lawn mower Petrol Black, Red