I use the Maxpedition Thermite Versipack. I love it. I still generally wear a back pack since I hike a lot to my search areas, so I carry water and snacks with me too. The leg bag is great and I have no issues. If I ever come across large or super heavy items I will toss them into the backpack. I keep my pin pointer attached with a magnetic lanyard to the belt and it has a good void for finds with several other pouches.
If you're not familiar with the brand, it's amazing. I own a lot of their gear. Some things are pricey, but they are solid quality.
I actually have the same exact one that you posted, and love it. I purchased this bag because of the multiple pockets. The very top sunglass pocket I use for Allen wrenches and spare parts for my carbon fiber shaft, the front small pocket I put my phone and keys in, then the other smaller pocket I put my finds in. The large pocket I put all of my trash. I chose this one because I can make sure I don't have anything in my pockets. although the leg strap is completely useless, I found that when I used the leg strap and bent over, it restricted my movement a lot. But it's a great bag to just hang off your side.
You could put crushed walnut hulls in one of the smaller pockets, where you'd put your coins, and it would clean your finds as you walk! 0f course they would just settle to the bottom....might still clean them some....lol.