---
product_id: 409697732
title: "mens Inertia 18 H2O Backpack"
brand: "gregory"
price: "1211 zł"
currency: PLN
in_stock: true
reviews_count: 2
category: "Gregory"
url: https://www.desertcart.pl/products/409697732-mens-inertia-18-h2o-backpack
store_origin: PL
region: Poland
---

# 3D Foam Backpanel for Airflow 3D Hydro Reservoir Included Multi-Functional Secured Pockets mens Inertia 18 H2O Backpack

**Brand:** gregory
**Price:** 1211 zł
**Availability:** ✅ In Stock

## Summary

> 💼 Elevate your daily hike with the Inertia 18 H2O — hydration meets high-function style.

## Quick Answers

- **What is this?** mens Inertia 18 H2O Backpack by gregory
- **How much does it cost?** 1211 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/409697732-mens-inertia-18-h2o-backpack)

## Best For

- gregory enthusiasts

## Why This Product

- Trusted gregory brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Hydrate Like a Pro 💧:** Patented 3D molded reservoir keeps you fueled and dries fast—no soggy mess.
- • **Breathe Easy All Day 🌀:** Multi-layer 3D foam backpanel maximizes airflow, keeping you cool on every trek.
- • **Lightweight Champion ⚖️:** At just 1.75 lbs, it’s the perfect balance of durability and featherlight comfort for daily adventures.
- • **Organize with Precision 🔒:** Dedicated hydration compartment doubles as a secure laptop/tablet sleeve plus exterior zippered pockets.
- • **Built to Last, Designed to Impress 🏞️:** Rugged nylon and polyester construction ensures your pack stays reliable for years of high-performance use.

## Overview

The Gregory Inertia 18 H2O Backpack is a lightweight, 18-liter daypack designed for men who demand comfort and efficiency on the trail. Featuring a patented 3D molded hydro reservoir, a ventilated multi-layer foam backpanel, and versatile secured pockets, it supports hydration and gear organization seamlessly. Crafted from durable nylon and polyester, this pack balances ruggedness with a sleek profile, making it ideal for hikes, daily commutes, or outdoor adventures.

## Description

Meet the Inertia 18 H2O daypack, where comfort and convenience collide. An included 3D Hydro reservoir and perforated 3D foam backpanel provide a complete hiking hydration system ready for all-day adventures.

Review: Small but great backpack for daily use. Very well made.
Review: Let me start my clarifying that hike about three days a week. So I definitely have high expectations of my gear. I used this to replace a 14 Liter Hydration pack that was always just a little too small. What attracted me to this pack was the light weight. The pack is comfortable and has a lot of great features. For example, Gregory's new hydration packs are a huge improvement from their old version. I think I like it better than Camelback at this point. However, the light weight comes with some sacrifice. The hip belt is just a 1 inch piece of webbing. When it arrived in the mail I thought oh no this thing is going to chafe. That occurred in some other packs when there was no padding on the sides of the hip belt. So far I've been pleasantly surprised that it doesn't chafe. However, the longest hike I've used this bag on so far is about eight miles. If I go for a serious 15-25 mile day, I have a feeling it might be a different story. Another disadvantage, is that there are no side compression straps. Instead they have these draw strings for your hiking poles. I don't love them and worry they will rip off when they get caught on trees, etc. The verdict is still out on the clasp on the breast strap. It's weird. It's not like a regular clip. It might be better because it won't rip the webbing off the should strap. I also think the tiny clasps are going to break. We'll see. All in all the pack is pretty comfortable and it caries a fair amount of gear quite comfortably. For example, my gear list includes: 2 liters of water Accessories bag with emergency fix items, like zip ties, small pocket knife, iodine tablets, head lamp, compass Rain Coat Lunch First Aid Kit GoPro Camera Nikon Z50 Camera with kit lenses Small carbon tripod The total load including the pack itself, hydration bladder and water is about 15 pounds. The bag carries the weight quite comfortably. The construction seems pretty solid. I expect to last me 3-5 years with heavy use. All and all I give the bag a 4 out 5 listing the deficiencies above.

## Features

- 3D Reservoir Included - included in a dedicated zippered compartment is a 3d hydro reservoir with a patented 3d molded design that works like a reservoir and dries like a water bottle
- 3D Foam Backpanel - a multi-layer foam construction with 3d foam on the surface layer to provide space for airflow even with the pack on your back.
- Multi-Functional Org - exterior accessed, secured zippered pocketing, and a dedicated hydration compartment that doubles as a smaller laptop or tablet sleeve
- Item Package Weight: 13.400282270000002 pounds

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09GWDYJS5 |
| Age Range | Adult |
| Batteries Included? | No |
| Brand | Gregory |
| Color | Brick Red |
| Customer Reviews | 4.5 4.5 out of 5 stars (16) |
| Date First Available | 13 November 2021 |
| Department | mens |
| Features | Adjustable |
| Height | 4 inches |
| Included Components | Backpack |
| Item model number | 141338-1129 |
| Length | 21 inches |
| Manufacturer | Gregory Mountain Products |
| Material Type | Nylon |
| Number of Items | 18 |
| Outer Material | Polyester |
| Product Dimensions | 53.34 x 40.64 x 10.16 cm; 612 g |
| Shape | irregular shape |
| Size | One Size |
| Sport | Hiking |
| Style | Daypack Backpacks |
| Usage | Hydration |
| Weight | 1.75 Pounds |
| Width | 16 inches |

## Images

![mens Inertia 18 H2O Backpack - Image 1](https://m.media-amazon.com/images/I/81PA+WCIofL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by K***S on 30 August 2023*

Small but great backpack for daily use. Very well made.

### ⭐⭐⭐⭐ Review
*by E***R on 28 August 2023*

Let me start my clarifying that hike about three days a week. So I definitely have high expectations of my gear. I used this to replace a 14 Liter Hydration pack that was always just a little too small. What attracted me to this pack was the light weight. The pack is comfortable and has a lot of great features. For example, Gregory's new hydration packs are a huge improvement from their old version. I think I like it better than Camelback at this point. However, the light weight comes with some sacrifice. The hip belt is just a 1 inch piece of webbing. When it arrived in the mail I thought oh no this thing is going to chafe. That occurred in some other packs when there was no padding on the sides of the hip belt. So far I've been pleasantly surprised that it doesn't chafe. However, the longest hike I've used this bag on so far is about eight miles. If I go for a serious 15-25 mile day, I have a feeling it might be a different story. Another disadvantage, is that there are no side compression straps. Instead they have these draw strings for your hiking poles. I don't love them and worry they will rip off when they get caught on trees, etc. The verdict is still out on the clasp on the breast strap. It's weird. It's not like a regular clip. It might be better because it won't rip the webbing off the should strap. I also think the tiny clasps are going to break. We'll see. All in all the pack is pretty comfortable and it caries a fair amount of gear quite comfortably. For example, my gear list includes: 2 liters of water Accessories bag with emergency fix items, like zip ties, small pocket knife, iodine tablets, head lamp, compass Rain Coat Lunch First Aid Kit GoPro Camera Nikon Z50 Camera with kit lenses Small carbon tripod The total load including the pack itself, hydration bladder and water is about 15 pounds. The bag carries the weight quite comfortably. The construction seems pretty solid. I expect to last me 3-5 years with heavy use. All and all I give the bag a 4 out 5 listing the deficiencies above.

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---

*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-03-18*