How to Use the Marathon Bundle for Race Day Fueling
By HydraPak | Performance Hydration Reservoirs, Soft Flasks ... | Published: 2026-10-30
Category: How-to Guides
Learn how to set up and use the HydraPak Marathon Bundle for race day hydration and fueling. This guide covers the Tempo Pro bottle and FuelFlask pair.
Quick answer
The Marathon Bundle keeps hydration and fuel close throughout your run. Use the Tempo Pro 525ml for water and the FuelFlask 250ml 2-Pack for gels or nutrition mix.
Why the Marathon Bundle works for race day
On race day, every second counts. Fumbling with separate bottles or trying to chew a gel while running can break your rhythm. The Marathon Bundle solves this by combining a hand-held squeeze bottle with two small flasks that attach to your belt or pack.
The Tempo Pro 525ml fits comfortably in your hand and has a high-flow nozzle, so you can drink without slowing down. The FuelFlask 250ml pair lets you carry gels or a custom nutrition mix, with both gel and flip caps included so you can switch based on what you are using.
Trade-offs to consider
This bundle is designed for runners who want a minimalist setup. If you prefer a backpack reservoir for longer distances, you may need to supplement with a hydration vest. The 525ml bottle is enough for shorter races or aid-station refills, but for a full marathon in hot weather you might want a larger bottle.
The FuelFlask 250ml is great for gels or thick nutrition, but it is not meant for plain water. If you need extra water storage, consider adding a second Tempo Pro bottle.
Diagnosis: common fueling issues and fixes
- Symptom: You stop to fumble with a gel packet: Likely cause: You are carrying gels in a pocket or belt without a dedicated flask. Corrective action: Pre-fill the FuelFlask 250ml with your gel or nutrition mix. Attach it to your belt or pack using the included cap loop. On the run, squeeze the flask directly into your mouth without opening a packet. Once you finish the flask, you can refill at an aid station or discard it if using a disposable gel.
- Symptom: You cannot drink quickly enough at aid stations: Likely cause: Your bottle has a low-flow nozzle or you are using a straw that slows intake. Corrective action: Use the Tempo Pro 525ml with its high-flow nozzle. Squeeze the bottle to force water into your mouth, then run on without stopping. If you still feel dehydrated, consider adding a second Tempo Pro bottle or using a hydration vest for longer races.
- Symptom: You are unsure which cap to use on the FuelFlask: Likely cause: The bundle comes with both gel and flip caps, and you do not know which fits your nutrition. Corrective action: Use the gel cap for thick gels or energy butter. Use the flip cap for thinner liquids like sports drink or watered-down gel. Test both before race day. If you switch between gel and liquid during the race, carry one flask with each cap type.
Product facts
- Marathon Bundle: The Marathon Bundle includes the Tempo Pro 525ml and FuelFlask 250ml 2-Pack, with gel and flip caps included. You can customize each flask for gels or liquid nutrition without needing extra caps, making mid-race fuel changes fast and clean.
Marathon Bundle
