Product Description
Long runs and race days call for a bottle, a phone, keys, and several gels, and all of it needs to stay put once the pace picks up. Nerd Belt has perfected the no-bounce belt and pack system, offering storage, fueling, and access all without limiting performance.
NBreverse is the first Nerd Belt made to be worn around your back with, so your bottle and fuel ride comfortably behind you while you knock off the miles.
Hydration you can reach on the move – Squeeze the pouch to slide the bottle in or out without stopping. It takes the included 550 ml bottle or a 750 ml bottle, so you can carry the fluid a long run calls for.
Fuel and essentials in their own spots – A phone compartment, room for four to six gels, and a hook for your keys let you find what you need without digging. It suits a half marathon, marathon, Ironman 70.3, full-distance Ironman, or ultra.
A belt designed to sit still – The strap adjusts to your waist, and Nerd Belt designed the NBreverse to sit securely on the small of your back without bouncing at any pace. Two sizes cover waists from 25 to 41 inches.
Nerdy Details
- Worn on the back
- Squeeze pouch for on-the-go bottle access
- Separate phone compartment, 4-6 gels, key hook
- Unisex with an adjustable strap
- Small: 65-85 cm (25-33 in) waist. Medium-Large: 75-105 cm (30-41 in) waist
- Pouch: 18 cm tall by 13 cm long, slight angle
- Included Bottle: 550 ml, leak proof, freezer safe, recyclable
How to Use Nerd Belt NBreverse
Sizing: Pick Small or Medium-Large by waist measurement, then tighten the strap until the belt sits snug.
Loading: Put your phone in its own compartment, your gels in the pouch, and your keys on the hook before you start.
Bottle: Fill the 550 ml bottle before you head out, and hand wash it after each use.
For gear that arrives damaged or falls under the manufacturer's warranty: Please send a photo of the damage or error message to hello@thefeed.com. We will either help process a claim for the product and a replacement product or Feed Cash will be provided, or we will direct you towards the correct place to make a warranty claim for the product. For returns on gear that you have used, we follow the manufacturer's instructions for satisfaction guarantees. This is specific to each gear product, terms and conditions may change.
Nerd Belt NBreverse Running Hydration Belt FAQ's
Everything you need to know before getting started.



Runners and triathletes who want to carry fluid, a phone, and fuel over half marathon, marathon, ultra, or Ironman 70.3 distances without a vest.
Small fits waists of 65-85 cm (25-33 in), and Medium-Large fits 75-105 cm (30-41 in). If you’re between sizes, measure your waist where you’ll wear the belt.
It’s designed to sit securely with no bounce at any pace. Cinch the adjustable strap snug before you head out.
Yes. You get a 550 ml bottle, and the pouch also fits bottles up to 750 ml.
It holds your bottle, 4-6 energy gels, your phone in a separate compartment, and your keys on a built-in hook.
The NB1100 also holds a 550 ml bottle, but our product page notes it’s designed for slower paces because the added weight bounces. The NBreverse is built to carry more fluid with no bounce at any pace.

