Water resistance vs. Water resistance
Water Resistant or Waterproof? What You Need to Know About X-Pac Bike Bags
Wondering if your bike bag will withstand the rain? Or maybe you're looking for gear for a multi-day bikepacking trip and want to make sure everything inside stays dry?
In the world of bike bags, we often come across two concepts: waterproof and watertight . Although they sound similar, they are significantly different. This difference can determine comfort (and dry clothes) when riding in the rain. In this post, we explain it using the example of bags made of the iconic X-Pac material.
What is X-Pac?
X-Pac is an advanced laminated material created by Dimension-Polyant – a leader in the production of fabrics for sailing and extreme sports. It is lightweight, super-durable and does not absorb water. It consists of several layers:
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Outer fabric (usually nylon) – abrasion-resistant,
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X-ply layer – provides structural stability (characteristic X-shaped fibers),
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PET membrane – responsible for waterproofness,
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Lining (optional) – for aesthetics and additional protection.
This material works well even in the most demanding conditions – which is why bikepackers all over the world love it.
Waterproof – what does it mean?
Bag marked as waterproof :
✅ Protects against rain and splashes
✅ Has a water-tight material (like X-Pac)
❌ But it may not have sealed seams and zippers
This means it will easily survive a downpour, but if you leave it out in the rain all day or accidentally fall into a stream, the contents may get wet.
Waterproof – another level of protection
A waterproof bag is one that:
✅ Has glued or welded seams
✅ It is equipped with waterproof zippers (e.g. YKK Aquaguard)
✅ Often has a roll-top closure
✅ It can even be submerged in water – and nothing will leak
It’s the perfect choice for expeditions in extreme conditions – but it comes with more weight, less flexibility and usually a higher price.
What about X-Pac bags?
X-Pac is a waterproof material , but a bag made of X-Pac is not always waterproof . What does this mean in practice?
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It can withstand driving in the rain, through mud and splashes,
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But it is not intended for prolonged contact with water or immersion,
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Seams and zippers can be a place for water to enter.
👉 If you are taking electronics, documents or clothes on a multi-day trip, it is worth storing them in a drybag or waterproof case.
Why choose an X-Pac bag?
It's not just a matter of style, but also practicality. Here are the biggest advantages:
✅ Exceptional resistance to abrasion and damage
✅ Ultra-light construction – perfect for long trips
✅ Aesthetic design – available in many colors
✅ Longevity – an investment for years
✅ Eco-friendly approach – VX21 and VX07 versions are made from recycled materials
Summary – what to choose?
| Bag type | Rain | Immersion in water | Libra | Practicality |
|---|---|---|---|---|
| Waterproof (X-Pac) | ✅ Yes | ❌ No | ✅ Light | ✅ Comfortable for everyday use |
| Waterproof | ✅ Yes | ✅ Yes | ❌ Heavier | ❌ Less flexible |
FAQ – Frequently asked questions
Can the X-Pac bag handle the rain?
Yes! The material itself is waterproof – great for riding in the rain.
Is the X-Pac bag waterproof?
No – seams and zippers may let water through if exposed to moisture for long periods of time.
How to keep valuables safe?
Use additional drybags or waterproof cases – especially for electronics and documents.
Check out our offer
Looking for an X-Pac bag that fits your needs? Our range includes lightweight, durable and stylish bike bags that are perfect for both city commutes and multi-day trips.
👉 See X-Pac bags in our store »
Not sure which one to choose? Contact us – we will be happy to help you choose the perfect solution.