The DromLite bags are fantastic. All the benefits of the regular Dromedary bags but at significantly lower weight. The Spigot cap, either on the bag at an increased price or sold separately, is key and makes the bags perfect for in-camp water storage and access. Love the Platypus 4.0 hanging water filter system too, because it makes filling the DromLite bags quick and easy.
Bought this for a 16 mile hike in 90+ degree weather, and I would have been in serious trouble if I didn't have all 6L. Fit perfectly in my pack and with the additional hydration kit, works just like a larger camelback. The material is also very sturdy and held up through a weekend of being poked around in my pack. Also seemed to keep my liquids fairly cool. Excellent alternative to camelback for larger sizes and use in a pack.
Used the 6L bag on a 3 day 23 mile backpacking trip where there was minimal drinkable water available. I ordered this bag based on the capacity. The bag material is durable and seems resistant to punctures and tears. The additional accessories (shower attachment, hydration hose, both sold separately) make this bag versatile for car camping as well.