I was going to mention Dark Souls, because their weight system is the best
You can carry as much crap as you want. Literally unlimited. But you can only actually equip so much stuff. Depending on how much equipment you are actually wearing, you move/roll faster or slower. It's a really good balance between mobility and defense that can be switched on the fly, and overall the system basically adds a layer of strategy and planning to the gameplay, without being annoying or cumbersome.
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_foolmo_
'You are obviously intelligent and insightful' - Sir Chris about me