So I'm starting a new campaign playing as a Dwarven Runesmith, set in the Warhammer world. The DM has decided to use the Variant rule for carrying capacity: Encumbrance. I think that this is a much better system, however I'm a bit confused as too what counted as "carried equipment". To use the example of my character: I have a backpack and other equipment stored on my person, I have no doubt that this would count towards the weight I'm carrying. However I'm unsure as to whether my armour counts as I have proficiency in wearing it. Also would weapons count? I imagine that they do if they're stored on me in their holders, but what about when I am holding them? The same can be asked for my shield.
Yes, armour counts towards encumbrance. If you're wearing 65lb plate armour, it doesn't count as weighing nothing because you're trained in its use. Weapons also count: lugging around a maul or pike weighs you down.
Anything that requires you to exert more force or spend more energy to move counts towards encumbrance. If you're carrying a heavy box in a warehouse, it is still difficult to walk regardless of whether or not it is strapped to you.