I picked up a new Shift v.4 a couple of weeks ago and am thoroughly happy with it. I bag 16 discs which, I think should be an optimal number for just about any recreational player. Here's my breakdown on the pros/cons:
Pros
- Lightweight, feels great on your back, hardly notice it's there all loaded up with 16 discs and a 32 oz. water bottle (I can't say enough about how comfortably it sits on my back.)
- Quality build
- Stands upright well, as some others have noted, a full water bottle definitely aids stability but still, even without, it stands well
- Discs are all easy to access and rest securely in place
- Decent storage space
- Sternum strap can be helpful (I will do away with the waist straps, not needed in my opinion)
Cons (I only have one)
- Storage space organization - while you can fit a lot of things into the storage space such as: lightweight fleece, additional water bottle, power bars, knife, sun block, repellent and bunch of other smaller items, everything just sort of floats around in a large space. It's not really a big deal but when you have the zip up flap tucked in there, you kind of have to root around to find smaller items. Things such as wallet and keys easily fit into the waist pockets. I tend to keep my cell phone in my back pocket as I use it for scoring but you could fit into the waist pockets as well.
Here's a picture:
https://brnomelater.files.wordpress.com/2016/06/55402f2ca13241a4f66626d2f23568b98953195e7607b9a50apimgpsh_fullsize_distr.jpg
lt is a great bag. I moved over to the Shift from a Fade Gear Crunch Box, which I also really like. If you can get by with 16 discs and two 32 oz bottles of water, a lightweight fleece and a load of smaller items, this bag will suit you well.