Outback 4 hydration pack

Special Price $107.99 Regular Price $179.99
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Multi Sports Backpack with Hydration

OUTBACK 4 is a lightweight hydration backpack designed for the performance minded, multi-sport enthusiast who needs 4L of storage capacity to carry personal gear and hydration. Whether you need a running backpack, skiing backpack, bike backpack, or motorcross backpack the OUTBACK got you covered. Equipped with soft mesh, highly ventilated shoulder and chest straps that allow normal breathing capacity and freedom to move. The lightweight back panel is also made with cool, breathable mesh. The OUTBACK 4 Plus offers the best fit available in the market with our award winning NDM 4-point harness system.

Stay Hydrated on In Action

OUTBACK 4 comes with an included 1.5L/50oz Hydrapak Elite™ hydration bladder with Slide-Seal top and fixed coupling. The bladder sits tight thanks to the compression sleeve and the drinking tube attaches easily and securely with the tube clip. So, there's nothing to worry about here! Just focus on going forward on your adventure.


Pack Type

Hydration Backpack


Multi Sport



Harness System

NDM 1.0

Chest Fit Range

Chest size range: 84 - 110cm / 33 - 43"


300g (*excl. bladder)


38cm Length / 17cm Width / 12cm Depth

Total Volume


Hydration Capacity

1.5L / 50 oz

Hydration System

Elite Hydration Bladder with Fixed Coupling



We measure size of our NDM 1.0 harness by using the "Chest Circumference" measurement. It's very easy to check your measurement and match it to the size of each pack. You simply measure 360 degrees around your chest under your breast (See picture for reference). You'll find the "Chest Fit Range" in the specifications tab.




When you set up your pack for the first time the harness will be set on the larger multi-size loop (the size loops are located where the stretch connect to the backpack). If a smaller size is needed make sure to use the inner size loop. After checking the size loop setting you start by using the horizontal velcro straps. Simply grab the straps on both sides at the same time, breathe in and set the strap where it fits.




Step 2: After setting the horizontal velcro straps you might have a perfect fit already. If you're for example a women with larger breasts or you’re use a chest protector you might need to change the vertical velcro  straps. If that's needed simply grab the velcro straps and set them at a good lenght. For women we recommend using these straps at a lower strap setting. We also recommend placing the straps underneath the breasts for optimal comfort.

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