Gregory Men's Inertia 18 H2O Hydration Pack
Compare prices from top U.S. retailers and find the best available deal.
MSRP
MSRP
Manufacturer's Suggested Retail Price. Note that MSRP values are not always consistent across retailers and may fluctuate or be inflated for marketing purposes.
$119.95
Typical
Typical Price
The median (middle price point) for the selected variant over the past 6 months—half the time it was cheaper, half the time it was more expensive.
$76.73
Hist Low
Historical Low
The lowest price GearSnag has ever tracked for this product variant.
$47.49
Current
Current Best Price
The current best offer available for the selected variant.
$76.73
Available Colors
Obsidian Black
Other Colors
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Product Details
Product Details
Whether traveling or trekking, the Gregory Inertia 18 H2O hydration pack transitions from trail to transit with its zippered pockets and a reservoir compartment that converts to a small laptop sleeve.
Key Specifications
| Brand | Gregory |
| Category | Hydration packs |
| Available Sizes | ONE SIZE |
| Available Colors | Brick Red, Indigo Blue, Obsidian Black, Red Rock, Redrock |
Where to Buy
Available at 4 retailers
Last Updated: April 19, 2026