Ultra-PE fabrics build lighter, stronger, more abrasion resistant bags.
Advanced Polymers
Our Fiber Flight Series are bags built from Ultra-PE fabrics (Ultra High Molecular Weight Polyethylene – UHMWPE). This unique polymer creates ultralight fabrics with unparalleled strength and durability.
10 years of Ultra-PE bags
At Rockgeist, we specialize in working with these unique fabrics. Combined with meticulous design and workmanship, these Ultra fabrics are an essential element in building best-in-class gear.
Differences Between Our Ultra Fabrics
Dyneema® Composite Fabrics (DCF)
A shiny non-woven composite laminate which is reinforced with Dyneema® fibers mated to a matte polyester backing.
Core Benefits:
- Lightest option for sewn bags
- Dyneema won’t absorb water in rain
- Unique, flashy patena
Ecopak® Ultra 200/400
A mix of woven Ultra-PE and Polyester, laminated to a polyester film.
Core Benefits:
- Highest abrasion resistance in its class
- Exceptional stitch retention and overall durability
- Available in white, black, grey, navy
Xpac® Ultra VX-40
Similar to Ecopak’s Ultra series this is a mix of a shiny woven Ultra-PE and Polyester laminated to a polyester film.
Core Benefits:
- High abrasion resistance
- Exceptional stitch retention and overall durability
ALUULA Durlyte™
An Ultra-PE film bonded to an Ultra-PE woven core.
Core Benefits:
- First & only weldable Ultra-PE fabric for 100% waterproof seams.
- Easy to clean – can’t be stained
- Won’t absorb water weight in rain
- High abrasion resistance
FIBER FLIGHT SERIES - Custom Framebags
Custom framebags made with Ultra PE fabrics; the toughest, lightest fabrics available. Maximizes durability while minimizing weight. Awarded Bikepacking.com’s 2018 Gear of the Year top pick.
Custom Lead Time
About 4-5 weeks for custom bags made to the shape of your bike. Check your place in our queue here.
PhotoFit®
Custom-made for a perfect fit using a strategic photo of your bike. View PhotoFit instructions here.
How Ultra-PE Fabric Weight Compares
