The 33.60 stands for the total weight you are currently carrying, the 145 stands for the maximal weight you are able to carry with your current strength. The 49 stands for the current capacity, meaning the already used space in your bag. The 0 stands for the max capacity you can carry...

Wait, that makes no sense, right? That's because the max capacity is bugged for quite a while now and sometimes shows 0 even though this is not the case. If I'm not mistaken, the max capacity is always 750, regardless of your strength.
Hope that helped

*Edit*
Just noticed my own max capacity is 790, which is actually a weird number, so I don't know what the max capacity is depending on.