How do I empty my bin without making a mess?

First, press the red wand release button on top of the wand and pull the wand away from the bin. Then hold the machine over a bin pointing downwards, and firmly push the red bin release button—the bin will slide down and the base will open. To minimize dust contact, cover your bin tightly in a dust proof bag while you empty it, then seal the bag tightly and dispose of it. Finally, push the bin base upwards until it clicks into place.

From the official Dyson V12 Detect Slim Cordless Vacuum manual, page 7

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