What are the properties of silicone coatings?
Silicone coatings are more complex than PU coatings and are usually applied to Nylon fabrics. The silicone coating increases the tear and UV resistance of the fabrics. Silicone coatings are dynamic when wet, which means they can stretch resulting in the need to re-tension the fly in wet conditions.
These fabrics cannot be factory seam-taped. In order to make the seams waterproof they are sewn with special cotton-wrapped polyester thread that expands when wet, sealing the stitch holes. For full waterproof performance of the seams a silicone seam sealer can be applied.
What is the difference between the terms "water repellent", "weatherproof" and "waterproof"?
All fabrics used in Exped packs are waterproof by definition and have a minimum water column of 1500 mm.
The differentiation is defined by construction and workmanship.
Water can penetrate the seams and zippers of our weather-repellant backpacks.
Weatherproof backpacks use fabrics with a minimum 3000 mm water column and feature water-repellent zippers and taped seams. These are very watertight but water may penetrate through the zipper in heavy rain or if submerged.
Our waterproof backpacks are made of fabrics with 3000 - 10000 mm water column, feature taped seams and water-repellent zippers are only found on the outside pockets, not on the main compartment. The main compartment is sealed by a roll-top closure.
These models feature pockets that are water repellent but not waterproof.
No rule without exception:
A 100% waterproof zipper is used in our Tempest Duffles.
How do women's and men's models differentiate themselves from one another?
The shoulder straps and hip belts of the women's versions are shorter than of the men's version and the suspension system is narrower and shorter. Details are found under the specific model.
Women's models can be used by men and vice versa.
What are the properties of PU coatings?
A PU coating makes the fly fabric waterproof. PU coatings remain flexible in cold temperatures and do not stretch when wet. PU coated rainfly seams can be factory seam taped for waterproof performance. PU coatings are less UV resistant than silicone coatings and can turn brittle with time. PU coatings are slightly heavier than silicone coatings.
The stated dimensions of my pack result in a different volume. Why?
Exped measures the volume of its packs using standardized plastic balls. The volume declarations are exact. The external dimensions are measured at the widest point. Calculating volume based on dimensions can lead to different values.
How can I use a hydration bladder in my Mountain Pro pack?
We recommend running the hydration tube between the main compartment and the lid (e.g. with slightly open roll-top). Alternatively the bladder can be placed under the lid when the roll-top is closed.
My backpack is damaged. Can it be repaired under warranty?
Mechanical abrasion, cuts, tears, burn holes, rodent bites as well as damage through drag-and-drop are not covered by warranty. In most cases these issues can be repaired at a moderate cost.
The coating of my backpack has delaminated. Why?
Storage of a backpack in humid conditions or wet gear in a pack can lead to hydrolisis and delamination of the PU coating. This is not covered by warranty and cannot be repaired.
Are seams covered by warranty?
Manufacturing defects of seams are covered by our 5-year limited warranty. Seams damaged through use do not fall under warranty but can be repaired at a moderate cost.
The zipper of my backpack malfunctions. Is this covered by warranty?
Zipper failure does not fall under warranty, especially if improperly used or not maintained regulary. Zippers should be kept clean. In most cases we can repair or replace damaged zippers for a reasonable cost.