User Review: Osprey Hydraform 2 Liter Reservoir
Price Paid: $27
Quality product. The rigid frame allows easy insertion into your bag and provide a nice handle when filling it up. Good amount of volume through the bite valve and the magnetic clip for your sternum strap is very convenient.
Be aware that this magnet can cause issue with medical implants, compasses, credit cards, etc. You don't have to use if you don't want to.