The Wilderness Bottle Bag is an old favorite. The large 32 oz. fits wide-mouth Nalgene bottles (bottle not included). The bag attaches to your waist or pack belt with our signature wrap-around belt loop (shown at right with the large size Bottle Bag). It retains the bottle two ways: With both a top strap that wraps over or around the cap and secures with Velcro, and/or nylon cinch cords and a Delrin cord-lock.
While we love Camelbaks, we don't believe in putting all our eggs in one basket -- especially if it's a soft-sided bladder. Nalgene and Camelbak polycarbonate bottles have proven themselves virtually unbreakable under the harshest conditions for many years. They also conveniently fit many water filters like the MSR MiniWorks, which is essential for long periods in the field where carrying your full water requirement is simply impractical.
The secondary pictures show a comparison of bottles: The 1-quart (32 oz.) Wilderness Bottle Bag (right) compared to 21-oz. Bottle Bag (center) and a Nalgene 28oz. bottle (left).