UltrAspire Traverse Hydration Pack

• 20 litre capacity: Substantial storage for larger mandatory-kit loads, additional clothing, food, hydration and other equipment when greater self-sufficiency is required.
• 4x 800ml soft flask carry: Two deep front pockets and two deep side pockets can each accommodate an 800ml soft flask, providing up to 3.2 litres of accessible bottle hydration. Soft flasks are not included.
• Front hydration pockets: Symmetrical deep pockets hold two soft flasks securely at the front, with compression stitching and cord locks helping prevent movement as they empty.
• Deep side hydration pockets: Extended pockets accommodate another two 800ml soft flasks within easy reach while also providing substantial accessible storage when not used for hydration.
• Externally accessible reservoir compartment: Insulated and padded rear sleeve accepts up to a 2 litre reservoir and allows access without opening the main compartment. Reservoir not included.
• Rear quick-stash pocket: External stretch storage with compression provides fast access to frequently used kit.
• Main rear compartment: Wide 180-degree zipped opening provides access to the primary storage area.
• Internal secure storage: Zipped organiser pocket with key clip keeps smaller items separated inside the main compartment.
• Shoulder storage: Two zipped top shoulder pockets provide quick access to smaller essentials.
• Layered front pockets: Two zipped pockets include padding, air mesh and sweat-resistant lining for secure storage.
• MaxO2 sternum system: Dual vertical adjustment helps tune the fit while allowing natural expansion during breathing.
• Load compression: Adjustable rear compression straps help control and stabilise the load as contents change.
• Integrated trekking-pole carry: Rear bungee attachments provide direct pole storage.
• Pole Quiver compatible: Attachment positions on both sides accept the UltrAspire Pole Quiver.
• Water-resistant construction: Silicone and PU-coated lightweight nylon helps resist water, abrasion and tearing.
• Breathable mesh: Large-hole mesh helps move moisture away from the body.
• Sweat-proof webbing: Resists absorbing moisture and becoming heavier when wet.
• Soft edge binding: Plush microfibre polyester edging reduces abrasive contact against skin and clothing.
• Safety whistle: Integrated into the front of the pack.

Measure around the chest while wearing the clothing you expect to use with the pack. The Traverse is available across five overlapping size ranges, allowing the fit to be selected around both chest measurement and the clothing normally worn underneath.

The MaxO2 sternum system provides additional vertical adjustment across the chest to fine-tune the fit and maintain stability as the load changes.

For information about UltrAspire running vests and hydration packs, see our UltrAspire pack guide.

If you are deciding how much carrying capacity you need, see our Running Backpacks, Race Vests & Hydration Packs Guide. Capacity should be considered alongside mandatory kit, aid-point spacing, water availability, weather, pace, access to crew and your preferred carrying strategy, rather than race distance alone.

If you are unsure about sizing, hydration setup or whether the Traverse provides the right capacity for your ultra-running kit, get in touch for straightforward advice.