CamelBak 1.5-Liter Lumbar Water Reservoir – Hydration Bladder – Faster Water Flow Rate – Leak-Proof Water Bladder – Ergonomic Shape – Big Bite Valve – BPA-Free – 50oz

One in each side on the dog’s pack gives good balance and the softness avoids bumps and rubs that come with bottles. Adjusted the value opening size to give faster water flow (I used the shut-off value so no leaks,) and can water the dogs without having to remove anything. Great for my old injured hands.

Great size and the tube is angled properly. I use this with my NorthFace waist pack and the bladder fits perfectly.