As title, any good/bad points?

Session I think. The larger ofvthe two.Works well, don’t really notice it on. Holds every thing I need

Have had a Session for years I like it a lot. Persuaded a mate to get one and he loves it.

The Session is very small (footprint is smaller than a sheet of A3) but has a Tardis-like ability to hold loads of stuff. There are compartments for pump/tools/mobile/tubes etc, a few gels and a packable windshirt. The reservoir is slightly OTT imo I much prefer the simplicity of a Camelbak but FWIW the tube and bite valve from a Camelbak fits quite easily.

I use it for trail riding and FR duties – elbow guards and a FF can be carried via the straps on the back.