[Waterproof] Sidekick 03 Expansion Bag

Take the extra gear with you, just as it is.

The Sidekick 03 is a 3-liter expansion bag compatible with Enduristan's proprietary expansion system, ESI (Enduristan Standard Interface).

With 3 liters of additional storage capacity, it is perfect for when your travel gear increases, such as camping equipment, extra clothing, or food.

Increase your capacity only when you need it.

That is the appeal of the Sidekick series.

The capacity you need, right where you need it

Because it can be quickly attached to ESI-compatible products, you can expand your storage to suit your travel style.

"I want to pack just a little more."

When that happens, you can add 3 liters of storage space, and when it's not needed, you can remove it to return to a lighter configuration.

Practicality, the Enduristan way

Completely waterproof, dustproof, and mudproof construction.
You can use it without worrying about rain or mud.

What is ESI (Enduristan Standard Interface)?

ESI is a new expansion system adopted by Enduristan.

By adding compatible expansion bags or bottle holders, you can build a cargo setup tailored to your specific needs and travel style.

Place tools where they are easy to access, or add a spot for frequently used small items right within reach.

The beauty of the system is how you can gradually cultivate it to fit your personal preferences.

Because these accessories are compatible across the range, you aren't just buying a bag—you are building your own travel system.