N-spire 6L Hydration Backpack - Unisex
Guide only. Tap cm or in to switch units.
Vests - unisex / men
One sizeSternum 56 – 114 cmSternum 22 – 45 in
Vests - women
| Size | Sternum | Bust |
|---|---|---|
| XXS – M | 66 – 84 cm26 – 33 in | 76 – 91 cm30 – 36 in |
| L – XXL | 84 – 104 cm33 – 41 in | 94 – 112 cm37 – 44 in |
| 1X – 3X | 104 – 127 cm41 – 50 in | 114 – 130 cm45 – 51 in |
Most Nathan vests are one size and adjust with the straps. Hydration belts too.
Reflective vests
| Size | Sternum |
|---|---|
| S / M | 61 – 102 cm24 – 40 in |
| L / XL | 96.5 – 114 cm38 – 45 in |
Worn over your layers. Between two sizes, take the larger one.
Tops - men
| Size | Chest |
|---|---|
| XS | 86 – 91 cm34 – 36 in |
| S | 94 – 99 cm37 – 39 in |
| M | 102 – 107 cm40 – 42 in |
| L | 109 – 114 cm43 – 45 in |
| XL | 117 – 122 cm46 – 48 in |
| 2XL | 124 – 130 cm49 – 51 in |
Nathan publishes chest measurements only.
How to measure
Sternum: arms relaxed, measure just below the chest bone, tape parallel to the floor.
Chest / bust: measure the fullest part, tape parallel to the floor.
All prices are displayed including taxes.
The amount shown is the final price you pay at checkout (shipping fees may apply).
Free shipping on all orders of $200 or more, in Canada and the United States.
Orders ship within 48 hours.
Enjoy 14-day returns after delivery.
Items must be new, unworn, and with original tags attached.
All prices are displayed including taxes.
The amount shown is the final price you pay at checkout (shipping fees may apply).
Free shipping on all orders of $200 or more, in Canada and the United States.
Orders ship within 48 hours.
Enjoy 14-day returns after delivery.
Items must be new, unworn, and with original tags attached.
All prices are displayed including taxes.
The amount shown is the final price you pay at checkout (shipping fees may apply).
Free shipping on all orders of $200 or more, in Canada and the United States.
Orders ship within 48 hours.
Enjoy 14-day returns after delivery.
Items must be new, unworn, and with original tags attached.
Why this price?
- Samples and overstock from major brands
- New products
- Limited quantities – no restock
The Nathan NSpire 6-liter hydration pack is designed for runners, hikers, and outdoor enthusiasts looking for a lightweight, comfortable, and practical solution for carrying their hydration and essentials. Its fitted design hugs the body to limit movement during activity, while its included hydration bladder provides quick access to water. Multiple compartments make it easy to store nutrition, light clothing, a phone, and essential accessories.
Features
✓ Storage capacity: 6 L
✓ 1.5 L hydration bladder included
✓ Adjustable shoulder and sternum straps
✓ Large rear compartment with bladder sleeve
✓ Expandable rear pocket for clothing and gear
✓ Easy-access front pockets
✓ External bungee cord for additional storage
✓ Reflective details
✓ Breathable mesh promoting ventilation
✓ One-size-fits-all adjustable
✓ Lightweight design suitable for running and hiking
Materials
✓ Lightweight and durable synthetic fabrics
✓ Breathable quick-drying mesh
✓ Durable components designed for outdoor activities
Highlights
✓ Ergonomic design limiting bounce
✓ Hands-free hydration with included bladder
✓ Multiple quickly accessible storage spaces
✓ Excellent breathability for extended comfort
✓ Lightweight and compact for short to medium duration outings
✓ Customizable fit
✓ Reflective elements for improved visibility and safety
