Einhell offers this lawn mower that has a collection box of 25 litres. A maximum cutting height of 70 mm is suitable if you like medium high grass.
From Amazon
Einhell Power X-Change 18/30 Cordless Lawnmower - 18V, Brushless Motor, 30cm Cutting Width, 25L Grass Box, 3 Cutting Heights - GE-CM 18/30 Li Solo Battery Lawn Mower (Battery Not Included)
Powertool World
Einhell GE-CM 18/30 Li-Solo 18v Power X-Change Cordless Brushless 30cm Lawnmower Body Only
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