---
product_id: 218649071
title: "Sierra DesignsFlex Capacitor Backpack, Adjustable 25-40L Volume Ultralight Backpacking Pack with Y-Flex Suspension System, Peat"
brand: "sierra designs"
price: "A$424"
currency: AUD
in_stock: true
reviews_count: 7
url: https://www.desertcart.com.au/products/218649071-sierra-designsflex-capacitor-backpack-adjustable-25-40l-volume-ultralight-backpacking
store_origin: AU
region: Australia
---

# Sierra DesignsFlex Capacitor Backpack, Adjustable 25-40L Volume Ultralight Backpacking Pack with Y-Flex Suspension System, Peat

**Brand:** sierra designs
**Price:** A$424
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Sierra DesignsFlex Capacitor Backpack, Adjustable 25-40L Volume Ultralight Backpacking Pack with Y-Flex Suspension System, Peat by sierra designs
- **How much does it cost?** A$424 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/218649071-sierra-designsflex-capacitor-backpack-adjustable-25-40l-volume-ultralight-backpacking)

## Best For

- sierra designs enthusiasts

## Why This Product

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

## Description

Sierra DesignsFlex Capacitor Backpack, Adjustable 25-40L Volume Ultralight Backpacking Pack with Y-Flex Suspension System, Peat

## Features

- Nylon lining
- Zipper closure
- 16" shoulder drop
- Think Outside: Meet the pack that does it all. The Flex Capacitor features adjustable volume to handle both short and long hauls, and a Y flex suspension system that carries above its weight class. With three sizes in a 25-40, 40-60, and 60-75 L capacity, there is a Flex pack to fit your needs. A bucket lid with a stash pocket closes everything up, while dual stretch pockets on the shoulder straps and side of pack cover shove it needs.
- Features: Expandable and Adjustable Volume | 2 stretch mesh side pockets | 2 stretch mesh hydration pockets on shoulders | Hydration compatible with removable reservoir sleeve | Zippered Hip Belt pockets | U Shaped top access zipper | Small stash pocket in lid | Ultralight weight | Lightweight Y Flex DAC suspension
- Specs: Torso Fit 16”-19” | Hip Belt Fit Sm/Md 29”-32” Md/Lg 32”-35” | Weight Sm/Md Hip Belt 2lbs 7oz Md/Lg Hip Belt 2lbs 8oz
- Materials: Body Fabric 100D Nylon-Poly Ripstop and 420D Nylon Oxford | Suspension Y Flex DAC Aluminum
- Warranty: Limited Lifetime Warranty – When purchased from an authorized retailer, Sierra Designs products are warranted to the original purchaser against manufacturing defects in materials and workmanship for the lifetime of the product. Contact our Customer Service team for prompt service or to answer any questions.

## Images

![Sierra DesignsFlex Capacitor Backpack, Adjustable 25-40L Volume Ultralight Backpacking Pack with Y-Flex Suspension System, Peat - Image 1](https://m.media-amazon.com/images/I/51PefHjyO0L.jpg)
![Sierra DesignsFlex Capacitor Backpack, Adjustable 25-40L Volume Ultralight Backpacking Pack with Y-Flex Suspension System, Peat - Image 2](https://m.media-amazon.com/images/I/51Itwuel4DL.jpg)
![Sierra DesignsFlex Capacitor Backpack, Adjustable 25-40L Volume Ultralight Backpacking Pack with Y-Flex Suspension System, Peat - Image 3](https://m.media-amazon.com/images/I/51eLzsPXZyL.jpg)
![Sierra DesignsFlex Capacitor Backpack, Adjustable 25-40L Volume Ultralight Backpacking Pack with Y-Flex Suspension System, Peat - Image 4](https://m.media-amazon.com/images/I/51Ddbe28vyL.jpg)
![Sierra DesignsFlex Capacitor Backpack, Adjustable 25-40L Volume Ultralight Backpacking Pack with Y-Flex Suspension System, Peat - Image 5](https://m.media-amazon.com/images/I/71M6xAAo4QL.jpg)

## Available Options

This product comes in different **undefined** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    One sweet looking, well-built pack!
  

*by M***R on Reviewed in the United States on July 23, 2020*

I love the hip pockets and the lightweight frame. Also the colors are fun but not obnoxious. The expandable capacity means I can use this as a day pack or for 2 day trips if I pack light. I searched long and hard for a new pack and this met all my requirements. Very pleased and highly recommend it.

### ⭐⭐⭐⭐⭐ 







  
  
    Simple and Flexible
  

*by B***S on Reviewed in the United States on November 3, 2020*

Super comfortable and frame really helped keep weight off my shoulders. Love the flexibility to adjust volume to suit the needs of my hike.

### ⭐⭐⭐⭐⭐ 







  
  
    Great materials!
  

*by A***R on Reviewed in the United States on January 19, 2021*

Excellent materials and ample space to carry what is needed!

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**Shop now:** [https://www.desertcart.com.au/products/218649071-sierra-designsflex-capacitor-backpack-adjustable-25-40l-volume-ultralight-backpacking](https://www.desertcart.com.au/products/218649071-sierra-designsflex-capacitor-backpack-adjustable-25-40l-volume-ultralight-backpacking)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-13*