The UltrAspire Speedgoat 4.0 is the most advanced version yet of Karl Meltzer’s signature long-distance waist pack; engineered for maximum stability, efficiency, and performance. Trusted by one of the most accomplished ultrarunners in history, this waist pack is purpose-built for athletes who demand the best from their gear.
Like all UltrAspire waist pack designs, the Speedgoat 4.0 positions weight near your center of gravity. This strategic placement dramatically improves balance and energy efficiency on technical terrain, making it the ideal companion for demanding trail runs and ultramarathons.
The newest version of UltrAspire’s Speedgoat waist pack comes equipped with two UltraFlask 550 Hybrid Bottles and redesigned insulated holsters. These holsters sit comfortably at the back of the hips, away from your natural arm swing. Both holsters feature a mechanical locking system that securely holds the bottles in place, preventing them from bouncing or launching while still allowing for quick removal. With the bottles snug against the body, the Speedgoat 4.0 offers one of the most stable two-bottle waist packs on the market.
Storage has also been improved in the Speedgoat 4.0. The 4-way stretch mesh pockets hold items you’ll need later, while dual side zippered pockets provide secure, fast access to essentials. The redesigned front pocket now accommodates larger items, like smartphones, more easily while keeping them secure.
Another smart upgrade is the inclusion of hidden Z-pole attachments beneath the front pocket. This allows you to easily deploy or stow trekking poles on the go or tuck the cords away when not in use. The updated adjustable waistband with a new hook closure ensures a comfortable, customized fit for a wide range of body types.
Key Performance Benefits
- Superior cooling: Keeps your core uncovered and reduces heat retention.
- Unmatched stability: Centralized weight improves balance and efficiency.
- Optimal load distribution: A smart 2/3–1/3 ratio creates natural equilibrium without the need for excess compression.
- Additional storage capacity: added zippered pockets allows you to carry more gear and go longer between aid
With this fourth-generation model, UltrAspire has made key refinements based on feedback from Karl himself. As his career evolves, the pack now features increased storage capacity, allowing runners to carry more and go longer between aid stations. It’s a thoughtful nod to the demands of ultradistance running and to Karl’s enduring legacy on the trails.
Ready to push your limits like the Speedgoat? Gear up with the Speedgoat 4.0 and experience the difference for yourself. Order now and hit the trail with confidence.
There are no clear instructions on how to keep straps to come loose when running. Natural running movement has me tightening the straps every 6 minutes. Is there a way to keep the waist straps from coming loose that I am completely missing? I am assuming that the buckles may help with this but I cannot find the precise information that confirms it.