Defender 15 Adventure & MTB Hydration Pack
Defender 15 Adventure & MTB Hydration Pack
Defender 15 Adventure & MTB Hydration Pack
Defender 15 Adventure & MTB Hydration Pack
Defender 15 Adventure & MTB Hydration Pack
Defender 15 Adventure & MTB Hydration Pack
Defender 15 Adventure & MTB Hydration Pack
Defender 15 Adventure & MTB Hydration Pack
Defender 15 Adventure & MTB Hydration Pack
Defender 15 Adventure & MTB Hydration Pack
Defender 15 Adventure & MTB Hydration Pack

Defender 15 Adventure & MTB Hydration Pack

Regular price $ 179.95 Sale price$ 89.98 Save $ 89.97
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The Best Hydration Backpack

🛡 Lifetime warranty. Crash-tested. Trail-approved.

Key Features:

  • 15L storage capacity with included 2L bladder, 3L upgrade available
  • Removable spine protector and back protective shell
  • Custom no-bounce Send It harness system for a secure ride fit
  • Multiple storage pockets and attachment straps for organized carry
  • Magnetic side carry system for quick access and extra versatility
  • Built for MTB, moto, snow, and all-weather riding
  • Backed by a lifetime warranty and 100% satisfaction guarantee

Built for MTB, Moto, Snow, and Big Days Outside

The Defender 15L Hydration Backpack is built for riders who need more than a basic pack. Designed for mountain biking, moto, snow, and all-day trail adventures, it gives you the storage, hydration, protection, and no-bounce comfort you need when the ride gets rough.

With 15 liters of storage, an included 2L hydration bladder, removable spine protection, and a custom Send It harness system, the Defender is made to carry your essentials without shifting around every time the trail gets rowdy.

Why Riders Choose the Defender 15

A good MTB hydration backpack should do more than just hold water. The Defender 15 is designed to keep your gear organized, your hydration close, and your pack stable when you’re climbing, descending, jumping, hiking, or hauling through rough terrain.

The removable spine protector adds an extra layer of protection for aggressive trail riding, while the no-bounce harness helps keep the pack locked in place. Whether you’re packing for a bike park day, a backcountry ride, a moto mission, or a spring ski lap, the Defender is ready to go.

Defender 15 Hydration Backpack Specs

Defender 15L Hydration Backpack Feature Chart
Feature Details
Capacity 15L storage for gear, tools, snacks, layers, and essentials
Hydration Bladder 2L bladder included, 3L upgrade available
Spine Protection Removable spine protector and back protective shell
Fit System Custom no-bounce Send It harness system with waist support belt
Storage Multiple pockets and attachment straps for organized carry
Carry Features Magnetic side carry system for quick access and added versatility
Best For Mountain biking, moto, snow sports, hiking, and adventure riding
Durability Built for all-weather riding and year-round outdoor use
Warranty 🛡 Lifetime warranty and 100% satisfaction guarantee

Hydration, Storage, and Protection in One Pack

The Defender 15 was designed for riders who want one pack that can handle real trail days. The included 2L bladder keeps hydration close, while the 15L storage capacity gives you room for tools, food, layers, gloves, and the small stuff that always seems to matter once you’re already out there.

The removable spine protector and back shell help separate the Defender from standard hydration packs. It’s not just a water backpack — it’s a protective, trail-ready pack built for riders who push into rougher terrain.

Built for More Than Mountain Biking

While the Defender 15 is a serious mountain bike hydration pack, it is also versatile enough for moto, snow sports, hiking, and year-round adventure days. The storage layout, attachment points, hydration system, and protective back panel make it a dependable pack when your day requires more than just a bottle and a phone.

Trail-Tested and Rider Approved

The Loam Wolf called the Defender 15 “one of the most thoughtfully designed packs” they’ve tested, highlighting its balance of function and comfort.

Read The Loam Wolf's Review

Backed by a lifetime warranty and a 100% customer satisfaction guarantee, the Defender 15 is built to handle whatever the trail throws at you.

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  • 5 stars: 12 (92%)
  • 4 stars: 1 (8%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
B
Benrody
Magic Backpack

The backpack stays locked in on aggressive descents with zero bounce, smart storage, and solid ventilation, while the gloves deliver elite-level grip, precise brake feel, and all-day comfort without sacrificing durability. This setup is performance-driven, trail-proven, and made for serious riding.

M
Msjourneyus
Send It NAILED this bag!

I DO NOT enjoy wearing backpacks while biking but sometimes it’s a necessary evil. But after seeing this bag and watching some videos and reviews I wanted to give it a try. SEND IT nailed this. Today was the first day I used it and I’m not even kidding I forgot I had it on except when I’d reach for the water hose did I realize it was there. Light despite having a full water bladder. I rode rough loose rocks, jumps, and flow today and absolutely did not feel a bounce, like it was in the way, and did not bother my shoulders/neck. After 16.5 miles I went back to the truck, my first move was to load the bike, not take off the bag which is never the case for me, even with a hip pack. Love the magnetic side pocket for my phone (I have an I phone 15 pro). Can’t wait for all the adventures this bag will come on 🤙🏻

A
Ashley
Defender 15 Adventure & MTB hydration pack.

I will continue to ride with this pack to learn and getting a true feeling of this pack. However I have had a few long rides with this pack and this is what I have so far.

Hydration Hose clip that was originally placed in the lower portion of the strap is not great placement for easy access to water. I moved the clip up to the opposite side, so the hose crosses my chest, it would be best to have a magnet style connection for quick and easy drinking. I ride super technical riding in Sedona and sometime taking one hand off the bars for long time is not the best option. I have always used a magnet style and it is super fast and easy to find.
Second and on of the most important. I find the chest strap to be odd placement it rest below my breast and is also hard to unstrap. I would suggest making that strap moveable, like up and down for placement. For women it is nice to be able to have precise strap placement for best comfort.

Likes: I really like the side pockets and how the pack fits on my back over all. As it is a large pack it is nice for long rides and I am able to fit essential items needed along with nutrition and enough hydration.

I would like to test it more for durability and longevity of the pack as I continue to wear it. I am happy to keep providing feed back and posting pictures of the pack in the beautiful Sedona, Arizona area.

R
Ryan Chase
The best hydration pack I’ve ever used!

I’ve used a few camelbacks and other hydration pack brands but the Send It pack is the best one I’ve used for mountain biking by far. My first time using it was during a 5 stage enduro race and it had enough storage for me to pack myself lunch, tools, and held enough water to keep me hydrated all 18 miles of riding. My favorite part about the pack was how well it fit, it didn’t hinder my riding at all and I didn’t feel any bounce even on the harsh roots and rocks through the course. I highly recommend this hydration pack to anyone who does long rides!

M
Mike Ireland
Best in the Game

I have a big truck and it's so nice to have a bike pad that actually fits. The design looks sick and fits all 4 of my bikes securely at once. I also got the Hydration pack which I am loving. Light weight and the actually hydration pack is so easy to clean with the full opening at the top with no leaking. Got the matching gloves to go with it. Stoked about this order. I will absolutely be ordering from them again.

A
Ale Herrera
Defender hidration pack

Recently got a package and i had to try it out on a full day of riding. Let me say it was the most comfortable bag ive owned to ride it had space for a full day of riding needs, also had a back protection pad that it great for unexpected falls. 10/10 product

A
Aaron Starks

Defender 15 Adventure & MTB Hydration Pack

A
Anthony Adams

Defender 15 Adventure & MTB Hydration Pack

D
Don Siegel
Awesome, well made pack

A nice sized, hard shell pack for day trips and longer bike rides!

r
robbie jackson
Best pack I’ve owned.

I’ve owned many packs to wear while mountain biking. This is the most comfortable and fits the best. The adjustable shoulder straps allowed me to fine tune the fit to my back and get the pack to sit exactly where I wanted it. Would highly recommend.

A
Amanda Lavigne
Lots of room and great quality

I’ve used a couple different hydration packs for biking and this one has very high quality straps and material. A few other brands I’ve used ripped quickly or the straps fell apart. Been on about 15 bike rides now and this is holding up great and has so much room for bike tools etc

M
Michael Wussow
Love it!

What not to like? Lightweight, great storage and added protection. It also looks great. A definite step up from the other hydration packs I've used.

J
Jeremy

Great Product!!! Holds so much! I can carry all needed emergency items, water, and the coolest feature is the way they figured out how to integrate the helmet pouch!


Recently viewed

  • 5 stars: 12 (92%)
  • 4 stars: 1 (8%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
B
Benrody
Magic Backpack

The backpack stays locked in on aggressive descents with zero bounce, smart storage, and solid ventilation, while the gloves deliver elite-level grip, precise brake feel, and all-day comfort without sacrificing durability. This setup is performance-driven, trail-proven, and made for serious riding.

M
Msjourneyus
Send It NAILED this bag!

I DO NOT enjoy wearing backpacks while biking but sometimes it’s a necessary evil. But after seeing this bag and watching some videos and reviews I wanted to give it a try. SEND IT nailed this. Today was the first day I used it and I’m not even kidding I forgot I had it on except when I’d reach for the water hose did I realize it was there. Light despite having a full water bladder. I rode rough loose rocks, jumps, and flow today and absolutely did not feel a bounce, like it was in the way, and did not bother my shoulders/neck. After 16.5 miles I went back to the truck, my first move was to load the bike, not take off the bag which is never the case for me, even with a hip pack. Love the magnetic side pocket for my phone (I have an I phone 15 pro). Can’t wait for all the adventures this bag will come on 🤙🏻

A
Ashley
Defender 15 Adventure & MTB hydration pack.

I will continue to ride with this pack to learn and getting a true feeling of this pack. However I have had a few long rides with this pack and this is what I have so far.

Hydration Hose clip that was originally placed in the lower portion of the strap is not great placement for easy access to water. I moved the clip up to the opposite side, so the hose crosses my chest, it would be best to have a magnet style connection for quick and easy drinking. I ride super technical riding in Sedona and sometime taking one hand off the bars for long time is not the best option. I have always used a magnet style and it is super fast and easy to find.
Second and on of the most important. I find the chest strap to be odd placement it rest below my breast and is also hard to unstrap. I would suggest making that strap moveable, like up and down for placement. For women it is nice to be able to have precise strap placement for best comfort.

Likes: I really like the side pockets and how the pack fits on my back over all. As it is a large pack it is nice for long rides and I am able to fit essential items needed along with nutrition and enough hydration.

I would like to test it more for durability and longevity of the pack as I continue to wear it. I am happy to keep providing feed back and posting pictures of the pack in the beautiful Sedona, Arizona area.

R
Ryan Chase
The best hydration pack I’ve ever used!

I’ve used a few camelbacks and other hydration pack brands but the Send It pack is the best one I’ve used for mountain biking by far. My first time using it was during a 5 stage enduro race and it had enough storage for me to pack myself lunch, tools, and held enough water to keep me hydrated all 18 miles of riding. My favorite part about the pack was how well it fit, it didn’t hinder my riding at all and I didn’t feel any bounce even on the harsh roots and rocks through the course. I highly recommend this hydration pack to anyone who does long rides!

M
Mike Ireland
Best in the Game

I have a big truck and it's so nice to have a bike pad that actually fits. The design looks sick and fits all 4 of my bikes securely at once. I also got the Hydration pack which I am loving. Light weight and the actually hydration pack is so easy to clean with the full opening at the top with no leaking. Got the matching gloves to go with it. Stoked about this order. I will absolutely be ordering from them again.

A
Ale Herrera
Defender hidration pack

Recently got a package and i had to try it out on a full day of riding. Let me say it was the most comfortable bag ive owned to ride it had space for a full day of riding needs, also had a back protection pad that it great for unexpected falls. 10/10 product

A
Aaron Starks

Defender 15 Adventure & MTB Hydration Pack

A
Anthony Adams

Defender 15 Adventure & MTB Hydration Pack

D
Don Siegel
Awesome, well made pack

A nice sized, hard shell pack for day trips and longer bike rides!

r
robbie jackson
Best pack I’ve owned.

I’ve owned many packs to wear while mountain biking. This is the most comfortable and fits the best. The adjustable shoulder straps allowed me to fine tune the fit to my back and get the pack to sit exactly where I wanted it. Would highly recommend.

A
Amanda Lavigne
Lots of room and great quality

I’ve used a couple different hydration packs for biking and this one has very high quality straps and material. A few other brands I’ve used ripped quickly or the straps fell apart. Been on about 15 bike rides now and this is holding up great and has so much room for bike tools etc

M
Michael Wussow
Love it!

What not to like? Lightweight, great storage and added protection. It also looks great. A definite step up from the other hydration packs I've used.

J
Jeremy

Great Product!!! Holds so much! I can carry all needed emergency items, water, and the coolest feature is the way they figured out how to integrate the helmet pouch!