Apologies if this has already been suggested. I searched but didn't see this.

Now that cargo has mass and degrades the maneuverability of ships, I think it would be helpful if the mass of cargo (total or by type) was displayed as part of the cargo HUD when you are flying around. This would be useful when determining how much cargo is safe to pickup in open space, such as when botting or pirating.

We should probably take it a bit further and display total mass of the ship in both the cargo and ship menus of the station. In the ship menu it should probably even give you a readout of how much it affects your top speed and acceleration rate (0 to 60m sounds fine.)