USWENew MTB Hydration Pack 3L - for Cycling, Mountain Biking, E-MTB and Gravel Riding, with 2.0L/ 70oz Water Bladder, Black-Blue

Can’t believe all the MTB packs don’t have the single lock mechanism. Fits snugly, doesn’t bounce around, looks cool, has everything you need. Make sure to get the one that has the helmet net and they do a terrible job of describing which models have them. The one I got has it and I love it. Fantastic pack, way better than anything else I’ve used (osprey, camelback, etc).

I bought this for a MudRun aka OCR. It definitely worked well with eliminating swaying while running however the shoulder straps ended up rubbing into my neck, cutting me. I know this is made for biking but someone suggested this for OCR and I would say maybe pass on it if that is what you are using it for. It also holds water in the bottom of the bag, so if you go underwater it will fill up and will not drain.