This is an outstanding hydration system! There's an excellent video from Source (the vendor) on YouTube that demonstrates all of the features. I'll attempt to sum up the features and my observations:Bladder/Tube...- Does not impart any kind of plastic or chemical taste to the water!- Soft, glass-like lining inside the bladder to minimize bacterial growth and keep the lining easy to clean. My observation is that the bladder feels *slightly* more rigid than most competitors- Has a patented top slide across the bladder that allows for easy cleaning/access to the inside of the bladder. I haven't had to reach in and clean anything yet, but it makes it easy to prop open to air-out after draining/rinsing out.- Uses an excellent clip system to easily connect/disconnect the tube from the bladder and from the drinking nozzles (and supports different types of compatible nozzles). I upgraded the nozzle to the Helix QMT valve system. Other reviewers mentioned it being a wise move - it's a nice upgrade over the standard one included with this system, IMO.- Feels very durable.- The bladder can be purchased individually so if you ever have a problem and/or want a backup/second bladder, easy to do without buying the whole system.- The tube is thick/sturdy. The insulation is 'okay' (water will warm up if you leave it in the tube)- 3-liter capacity. The extra water really helps - I easily drink 2+ liters on a day-outing, but rarely run out of the entire 3.Pack...- The pack is a very heavy duty, military grade canvas-like material. I can't imagine anything short of a razor sharp knife or bullet being able to cut or penetrate it.- EXCELLENT insulation quality. After several hours in the hot Utah desert sun, the water inside was still cool!- The pack very securely fastens to the bladder using the cap. This makes it very easy to fill/drain without opening the pack and/or removing the bladder.- The straps are comfortable, but do not provide much padding. In practice, I think it's sufficient - I've taken it down into the southern Utah canyons and Uinta mountains and never felt uncomfortable with it.- The chest strap helps secure the shoulder harnesses in position and offsets some of the load across your sternum.- A velcro strap secures the tube over the shoulder - the tube was always easily accessible- The straps can easily tuck away to support dropping this system into a backpack- It's MOLLE-compatible so you can store the straps and connect it to the back of a MOLLE backpack. Pretty common configuration with military.I know there's more to the system than I'm listing - again, check out the video.Overall, I love the system. My one grip is that there are no additional storage pockets - it's not designed like many camelpaks that are more like hybrid backpack/hydration systems. This is purely a hydration system. Other than that, I can't think of a single complaint. If you're looking for an excellent, durable, well-insulated hydration system - you can't go wrong with this. The bladder and pack are both outstanding and the modularity of the system is fantastic.