Makita BO5020 Instruction Manual page 7

Emptying dust bag
When the dust bag is about half full, switch off and unplug the tool. Hold the tool and
remove the dust bag from the dust nozzle while pressing the push button.
After emptying the dust bag, insert the
hook on the dust nozzle into the rectangular
hole on one side of the dust bag frame and
push up the dust bag frame until it clicks
into place on the push button.