Weight
Items in the game have a weight.
Player Weight
Items in the Player's Backpack or Equipment slots increase the player's total weight. The player's weight also increases when mud 
accumulates on them from moving in puddles during Rain Storms. The player's current weight can be viewed by putting their cursor on the weight 
icon at the top of their inventory menu.
Encumbrance
Players can carry up to 150 weight without penalty. Beyond that they start suffering from an encumbrance penalty which increases with additional weight. Encumbrance is displayed as a percentage at the top of the player's inventory menu. Encumbrance reduces the player's Stamina regeneration and increases Stamina drain when sprinting.
Above 360 weight (52% encumbrance), players get the "Encumbered" status effect. It does not give any new penalty but inform the players about their encumbrance level.
Beyond 550 weight (100% encumbrance), players get the "Overencumbered" 
status effect. Their Movement Speed and Stamina regeneration are greatly reduced, their Stamina drain when sprinting is also greatly increased, and they cannot enter vehicles. Players also collapse for a moment if their stamina bar goes under 20% and turns red.
The encumbrance penalty does not grow beyond 550 weight.
Vehicle Weight
Some vehicles also have weight and encumbrance, displayed similarly in their inventory menu. The items they carry and the mud on them 
increase their weight. Their weight thresholds for encumbrance penalty and the "Overencumbered" status effect depends on the vehicle type.
The encumbrance penalty increases the vehicle's mass which adversely affects the vehicle's control and agility (speed and acceleration). The penalty is maximum at 100% encumbrance and does not increase with more weight.
When overencumbered vehicles that were able to tow other vehicles can no longer do so.
List of vehicles affected by weight:
