Canister under rear of seat?

[willowstreetguzziguy]

What does the canister do that is located under the rear tail section of my 1200 sport?

[Dr. Enzo Toma]

Can you tell what's plumbed into it? I'm not familiar with the 1200 sport, but a plastic canister on a motorcycle is often a charcoal canister as part of the EVAP system so that your fuel tank doesn't vent to the atmosphere and smell of gasoline fumes, or perhaps a breather box for engine blow-by.