When I happen to cross this hydration pack I slapped myself because I had had this idea before.... What if I took my Camelback Viper and sewed some mesh on to it so I could carry a few discs?.... Well someone followed through with that great idea, probably had it before me too LOL.If you know your course you can cram more than enough discs than you need, if you don't you can get enough in there to be sure you're covered. I was able to comfortably fit eight discs in the six slot model without feeling too full... You can cram two in each slot if you desire it ...will be a little tight if you throw deeper discs.Design of the bag is top notch it is not too small for my huge frame but not too large for my much smaller wife. Comfortable, and seems well made. Two carabiner hook holes provided me a spot to carry my disc retriever, chalk bag, and towels. It has a divided zipper pouch on the right hip pad, enough to carry a few small items I usually have like lens cleaning cloths, a marker for discs, and some hydration packs. A larger zippered pouch near the bottom center of the back was big enough to hold my cell phone. And even larger zippered pouch at the top of the center back was large enough to hold a dozen protein bars and other small items like my keys.Hydration pouch is completely separate and if need be could hold even more cargo.The straps are heavier duty than they need to be for this size of rig and are well padded. The drink holder will easily hold a 40 oz insulated water container, may hold larger. Combined with a 3 l bladder, plenty of hydration for most people for all day.I normally roll a cart stuffed with way too much gear some say, I like to be prepared and being a giant means I can carry my cart across the creek if I need.... However for some courses that have lots of elevation change and rocky scrabble to climb up/down.... This is the ticket.Seems like a very well thought out and designed product, I am impressed. Just purchased another for my wife who basically demanded one after she tried mine.Company seems very wholesome, will plant a tree with every purchase!This is a good travel bag or casual round bag for disc golf. At 4 to 8 disc I can carry enough discs to have fun on any course. I can throw with the bag on but my short arms can't put the disc back in the slots while it's on my back. I don't know what a mesh pocket is for, maybe put your season pass in there so you don't need to take it out to show the ranger. The other 2 pockets just fit my phone, keys, and wallet. The water bladder is nice to have but the small water bottle holder is just clumsy; maybe just to carry an emergency water bottle or when you don't need the water bladder.I can't recommend this bag highly enough! It's the perfect blend of storage and convenience, especially with the 2L hydration package.I've got about 25 discs in rotation, but I'm never using them all in a single round. Weather, course, wanting to get used to the same disc over multiple throws in the same round- I always just used like 6-8 per 18.The big bags were a pain and felt like a waste because I just had a few discs rattling around. Or I'd fill it up and never use 15 of them and just be carrying extra weight on my hilly local course. The little sling bags all sucked for me because they were a pain to put on and off and not really worth the extra hassle.Instead, my go to was just picking four discs, holding three in my non throwing hand, and filling up cargo shorts with keys, water bottle, etc.This is 100% what I was looking for. Easy access to water, simple to sling over one shoulder, and the exact amount of weight/room I needed for how I like to play.If you're really advanced and want to throw 20 different discs per round, this clearly isn't for you. But if you're looking for something better than disc purses that still keeps you pretty unencumbered, I can't imagine anything better.Before I discovered this Rogue Iron bag, there were five imperfect options for carrying discs:1. Use your hands! Love the old school, but obviously we can do better.2. Hip holster that buckles to your thigh. Limited to 2 pouch slots, but completely hands free. My absolute favorite for running a quick round with only 3 discs, but no excess pocket space for keys, phone, or water.3. Shoulder strap boxy bags for 15 discs. Not my favorite because the discs never sit properly vertically slotted inside, they always tip over on each other. Also the bag is never weighted for easy picking up and slinging on.4. Backpack that weighs 10 pounds and stores 100 discs that I never use.5. A rolling cart. Um. Y’all can do your thing but I’m gonna pass.This Rogue Iron bag is the solution to all my problems. I hardly even care if parts of it wear and tear because the utility value is through the roof and price point is awesome.Pros: Comfortable, secure fit, lots of storage pocketsCons: The product description indicates that it holds up to 8 discs, however in practice, any more than 4 discs (1 per pouch) results in a very tight squeeze that requires a fair amount of effort to get discs in and out of the pockets. This is exacerbated if you've got a full hydration bladder. The bladder pouch is also somewhat difficult to zip up when the bladder is full.Final: I really like this bag for the course near my house that's in walking distance. If I'm travelling further, I take a larger bag with better disc storage.Best part is you only take what you need. You don’t have to take 40 discs. Not sure why anyone does anyways other than to hold up the discs they do use.Bad part. Hydration pack takes up a ton of room. I took it out. Don’t need it.Second bad part. Don’t leave the discs in the bag in a hot car for a long time. Mine warped as they are stacked half on the disc above. I took them out and laid them flat next to a heater and they’re good as new. Lesson learned.Overall great bag though. Get lots of compliments at tournaments