Ethan BrooksBy Ethan Brooks

Updated November 2026

A sis energy gels multipack is the most practical way to stock up on fuel for training and racing, but the right box depends on how long you run and how often you need to take gels. For most marathoners, one gel every 30 to 45 minutes after the first hour is a sensible starting point, which means a single long run can use three to five gels. Buy enough to cover your longest training blocks plus a spare for race week, and test every flavor before race day.

Why a Multipack Makes Sense for Training

Buying gels one at a time gets expensive and leaves you short when a long run lands on a day you forgot to restock. A multipack gives you a consistent supply, which matters because you should be rehearsing your fueling plan throughout the build, not just on race day. Your gut adapts to carbohydrate intake over weeks, so regular practice with the same product is more useful than occasional use of several brands.

Shopping for one? See our guide: SiS GO Energy Gels Review: Features and Performance.

Factors That Affect How Many Gels You Need

Three variables drive your total: run duration, your personal intake target, and how many long sessions you complete each week. A runner doing a 20-mile long run with a gel every 40 minutes needs about four gels for that single session. Add a second long run and a race-simulation workout, and a multipack of 12 to 15 can disappear quickly. Heat and humidity also raise your fluid and electrolyte needs, which can change how you combine gels with water or sports drink.

What to Do Before You Commit to a Box

  • Work out your target intake first. Many runners aim for roughly 30 to 60 grams of carbohydrate per hour, though your needs depend on body size and tolerance.
  • Check the carbohydrate content per gel on the packaging, then divide your hourly target by it to find how many gels you need per hour.
  • Buy a multipack with a flavor mix you can tolerate, and rehearse with each one on training runs rather than trusting that a flavor you like will sit well at mile 18.
  • Store unopened gels in a cool, dry place, and keep a few in your bag on every long run so you never miss a feeding.
  • Take each gel with water as the label directs, and avoid stacking several gels back to back without fluid.

For a deeper look at timing your intake, see When to Take SiS Energy Gels: A Timing Guide for Runners (2026). If you are weighing a larger box, SiS Energy Gels 30 Pack: How to Choose, Use and Fuel Your Long Runs covers how to plan a bigger supply across a full training cycle.

What We’d Use

A plain multipack of standard isotonic gels is the simplest starting point for most training plans, since it lets you rehearse one familiar product. SiS GO Energy Gels are a common choice for runners who want a straightforward carbohydrate source without added caffeine; search for them with View on Amazon.

If you plan to use caffeine in your final hours of racing, a caffeinated variant in a separate box lets you keep it out of training until you have tested your tolerance. Search for View on Amazon and try it only on long runs first.

FAQ

How many gels should I buy for a marathon?

Most marathoners use three to four gels on race day, taken roughly every 30 to 45 minutes after the first hour. Buy enough to cover your training plus one extra box for race week and a backup.

Can I use a multipack of gels with electrolytes?

Some multipacks include electrolyte versions, which can help on hot days. Test them in training first, and consult a sports dietitian or physician if you have a medical condition or take medications that affect fluid or electrolyte balance.

How long do unopened gels last?

Check the best-before date on the packaging. Keep them in a cool, dry spot away from direct heat, and do not use any gel that looks separated, smells off, or has a damaged wrapper.

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Ethan Brooks

About Ethan Brooks

Ethan Brooks is part of our editorial team and reviews and edits our marathon & half-marathon guides, checking product details against manufacturer specifications and owner feedback.