The Encumbrance of an Item is the combined size and material.
Encumbrance Capacity (EC): The maximum Encumbrance you can carry without it affecting your activity. A character without measurable Encumbrance CAN be Unfettered if they meet all other requirements.
Hampered:
(Load/Encumbrance < EC) No Movement penalty (incl. from Exhaustion), no Armor, nothing held, no targeting barriers (helmet)/no muffling of sound.
(Load/Encumbrance >= EC) No Movement penalty (incl. from Exhaustion, but not Difficult Terrain), Proficient in Armor worn, one arm free, basic line of sight and hearing unobstructed,
(Load/Encumbrance > EC x2 )
(Load/Encumbrance > EC x5 )
Non-proficient with aArmor/Shield/Weapon; senses directly impinged, [normal] Movement reduced (incl. from Exhaustion, but not Difficult Terrain)
Std. d20 Weight Capacity: Encumbered = 5 times your Strength score / Heavily Encumbered = 10 times your Strength score; Size Category determines lift, drag, and carry factors along with Powerful Build = +1 Size Category.
Encumbrance Capacity = CARRY CAPACITY = 2 + Lowest of Strength and Constitution adjustments.
All items they use must match the character’s Size (Factor). If not, worn items cannot be worn effectively at all, held items increase by +1 ENC per category greater. If you do not meet minimum strength or dexterity for an item = +1 encumbrance per condition unmet.