The Motherlode Mil Spec Crux Lumbar Backpack (46L) from CamelBak has been redesigned from the classic Motherlode model now with 3 liters of Mil Spec Crux Lumbar reservoir but still with the same good space for content and great properties. The reservoir now provides 25% more water per. sip and moves the water low providing higher stability and comfort. The backpack is perfect for multi-day missions as it holds a total of 46 liters where you have plenty of space for your gear, water and much more. For this, you can easily and quickly attach extra gear using the new laser cut Mountain MOLLE.