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Fuse 12L

  • All SOURCE Hydration Systems are BPA and EA Free

Our mid-volume pack keeps you light on the trail, offering a 3L/100oz Widepac Hydration System along with 12L of cargo space in three separate compartments, including a padded pouch to protect your mobile. The structured padded back design facilitates back-ventilation.

  • Raincover for this pack included
  • 3L SOURCE Hydration System included
Fuse 12L Coral Blue
Care & Use

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Fuse Hydration Pack designed for biking

3L / 100oz Widepac Hydration System - 12L Cargo

A light weight mid-volume pack that keeps you light on the trail. 12 Liters of cargo is just what you need for a short ride or hike. Separated between three compartments, one of them padded to protect your mobile, cargo is easy to organize. A structured back system improves ventilation of the spine area of the back.

Fuse Hydration Pack Features

  • Lightweight Fabrics 
  • Padded shoulder straps
  • Adjustable sternum belt with integrated whistle
  • Padded and vented porous foam back system 
  • Lightweight buckles
  • Essentials compartment with internal Storeganizer™, key holder, pen pockets
  • Velcro sealed phone pouch
  • Insulated hydration compartment
  • Raincover included
  • Carrying handle

SOURCE Hydration Features

  • Widepac™ hydration system
  • Helix™ bite valve - Comfortable valve with safety shut-off mode
  • Co-Ex tube
  • Triple layer taste and odor free film
  • Glass Like™ Film Technology
  • Grunge-Guard™ Technology
  • Taste Free™ System
  • Easy Care & Low Maintenance

SOURCE Hydration Technology

Widepac Closure (U.S Patent No. 7,648,276,B2) - The original user-friendly Widepac™ Slide Closure opens wide, allows easy filling, cleaning, draining, and ice insertion. Airtight seal. Most SOURCE Hydration Systems and Hydration Packs feature reservoirs with our signature Widepac Closure.

Taste-Free™ System - Our co-extruded PE film retains the pure taste with absolutely no plastic flavor, also over time. (BPA and Phthalate free.)

GrungeGuard™ Technology - Our GrungeGuard™-Technology inhibits bacteria growth on the reservoir and drinking tube for the life of the system. Technology utilizes FDA-approved and EPA-registered anti-microbial agent. 

Glass-Like™ Technology - SOURCE's Glass-Like™ Film is 2000% smoother than standard TPU films, with virtually no difference from glass itself. This multi-layer Polyethylene film, manufactured in accordance with SOURCE's Glass-Like™ technology, prevents bio-film build up, making the system virtually self-cleaning.

Easy Care & Low Maintenance - Glass-Like™ technology combined with Grunge-Guard™ technology represents a new generation in hydration systems, in which cleaning is no longer an issue! Simply refill with water and drink again and again without special care. Water will remain fresh for days and even weeks. 


  • Cargo Volume: 12L
  • Hydration Volume: 3L Widepac (shipped with pack)
  • Weight: 0.5 kg / 1.1 lb
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Fuse 12L

Fuse 12L

Our mid-volume pack keeps you light on the trail, offering a 3L/100oz Widepac Hydration System along with 12L of cargo space in three separate...

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Great bag, lots of features
I love this pack and all the bells and whistles included. It holds what I need and the bladder works great. Plenty of water in the 3L bag for a full day ride. The only reason it isn't 5 stars is because of the fit. I'm an average size woman with a sizeable chest, so the straps are pushed far enough under my arms that when walking for a long time the strap starts to make my arms raw from constant rubbing. I don't want to have to always wear long sleeves for it to be comfy, but I don't really have a choice. I've made lots of adjustments but it still doesn't sit right. It would be awesome if Source had women-specific bags to account for the vast difference in chests between men and women. They make excellent products.
This review has been posted for  Fuse 12L
Reply by SOURCE
Thank you for your feedback, our developers appreciate your input! 
My go-to hydration pack
The Source bladder stays clean despite use 3-5 times/week. It also doesn't retain flavors of electrolytes solutions, and the 3L capacity is key in hot climates.

I like the capacity of the bag as well; 12L is the right size for bike tools, food, and maybe an extra layer when needed. The lightweight straps give plenty of breathability without digging in.

I only wish the zippers and elastic were better quality. After about a year and a half and then the zippers start to fail and the elastic strap retainers aren't elastic any more. But, I like the bladder system so much and the overall design of the bag I will replace mine with the same anyway.
This review has been posted for  Fuse 12L
Reply by SOURCE
Hi Kevin, thanks for your feedback. Happy to hear you love the Fuse! With the Fuse we issued a pack for price sensitive customers that use a pack occasionally. For heavy duty use, 3-5 times a week as you write, you might want to take a look at one of our more upmarket packs. Up to you. Safe riding! 
Bag material degraded with use (sweat, biking) after 3 months. Will probably need to replace it next year, unfortunately. Still like it and use it often.
This review has been posted for  Fuse 12L
Reply by SOURCE
Hi Tyler,  please get in touch with our Customer Service if your pack is not holding up as it can be expected from a SOURCE pack! Hope it'll last you many more years. 
awesome kit
Super sweet, very nice bladder system
Lots of storage
Took a month to get to western Canada
Great for mtbing, looking forwards to a solid riding season with tonnes of water. 3L is a lot!
Chest strap seems high
Waist belt and shoulder straps are good. Overall happy.
This review has been posted for  Fuse 12L
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" Our tester left water in the Widepac for eight weeks without cleaning and reported no stinky taste or smell."
" More to love: The top opens wide like a paper bag for rapid filling. "

Source Widepac

" The test ride was nothing short of brutal, in thick blizzards ... Everything in the bag was still bone dry."
" The removable bladder in the Source Fuse was the best I’ve ever used."
" I had to shove a whole lot of things in this backpack. The shape of the bag didn’t change or bulge at all."
" Most of the time I was cycling I almost managed to forget I was wearing a hydration pack at all."

SOURCE Ultimate Review
Source Ultimate Review

" Forget about the plastic taste of your standard hydration system. The Widepac gives you full original taste of your drink from the first sip."

Vital MTB
star star star star star
Source Widepac Hydration System

" Filling up Source bladders is easy thanks to the wide opening."
" The Helix is drip-free, and very easy to drink from. "
" It is one of the easiest to use thanks to its nearly self-maintaining properties, and it is completely taste-free."