ULTRASPIRE RUNNING WAIST PACKS & BELTS

Fitted Race Belt 3.0 is the lowest-profile fitted option, while Element 2.0 provides adjustable storage. Synaptic 3.0 adds dedicated single-flask hydration, and Speedgoat 4.0 carries two flasks with more storage.

Lightning and Mountain Racer take a different approach. Both are sized, tubular step-in waist packs designed to control heavier loads using engineered stretch materials and separate compression. Lightning provides 2 litres of capacity in a lower-profile design, while Mountain Racer increases this to 3 litres with more hydration and external carrying options.

Fitted Race Belt 3.0 is the more minimalist and closely fitted option. It is available in separate sizes, which can provide a more precise fit than a continuously adjustable belt.

Element 2.0 is adjustable and provides four separate storage areas, making it more flexible for organising food, phone, valuables and other kit. Both can carry a soft flask, but neither requires hydration to be carried at the waist.

Synaptic 3.0 is the more compact hydration option, with a single 550ml UltraFlask carried in a dedicated rear holster and additional storage for food, phone and other essentials.

Speedgoat 4.0 carries two 550ml UltraFlasks and provides more storage, making it useful where you want around a litre of hydration at the waist together with accessible food and equipment.

Both use a fitted tubular step-in construction, ErgoFit shaping, engineered stretch mesh and separate rear compression to stabilise heavier loads. Lightning is the lower-profile option at approximately 5 inches high, with 2 litres of capacity and an included 625ml locking soft flask carried at the front.

Mountain Racer is approximately 5.5 inches high and increases capacity to 3 litres. It includes an 800ml locking soft flask and adds greater hydration flexibility, Bloddle compatibility, removable aluminium rear Z-pole attachments and front bungee carrying.

Adjustable models allow the fit to be changed using straps or other adjustment and can be useful if you want flexibility in where the pack sits or how it fits over different clothing.

Fitted models are offered in separate sizes and use their shape and stretch to sit closely around the body. Choose the size according to your measurement where you intend to wear the pack, whether that is higher around the waist or lower towards the hips.

UltrAspire uses ErgoFit shaping designed to follow the body's natural waist and hip shape. Fit, stretch and load distribution vary between models, while the higher-capacity fitted packs also use separate compression to pull heavier loads closer to the body.

No waist pack is completely immune from movement. Running style, carried weight, how the load is distributed and how securely the pack fits can all affect bounce and comfort. Overtightening is not necessarily the answer, particularly over ultra distances.