Backcountry Research Mutherload Strap

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Product Description

The NEW Mutherload maximizes all the benefits of our dual-shockcord retention system with the versatility and adjustability to mount what you want, where you want it, anywhere on your frame. This strap will flat out stick like "poo to shoe" over the most demanding XC/Enduro race courses and trails anywhere.

Super lightweight and constructed with rugged materials, you have two choices on how you can have your strap built-up. You can go with our bomber thick sliced Hypalon (in black only) or you can choose to go in style with over 50 patterns and colors to choose from...your call.

To Load: Simply center the tube on the grip-strip and pull the dual shockcords up and over the ends of the tube to lock it down...flip it over and slide in your choice of inflation, multi-tool or levers.

To Mount: Frame your bundle where you want it with the tube and shock cords facing the frame. Feed the slack end through the contoured loop and reef.

Sized to fit a standard 26", 27.5" or 29" tube by itself or with 1-2 16g cartridges, 1-2 20g cartridges, 1-2 25g cartridges, multi-tool, mini pump, levers or whatever combo you want.

  • Quickly and easily mounts anywhere on your frame.
  • Adjusts to accommodate frames as small as 4" in circumference (think steel frame) all the way up to a 9" circumference carbon frame.
  • 1" width easily fits in tight spaces.
  • Unique design maximizes grip quotient to keep your precious cargo from hula hooping.
  • No more juggling, rubber bands or one handed cinching. Our proprietary dual shockcord preload-strap keeps your tubes, levers, inflation more tightly bound to keep your goodies from falling on the ground during installation.
  • Heavy duty Bartacks used on all shockcord stress points.
  • Intuitive on/off design.
  • Picker free and won't snag shorts.
  • Sewn with #92 industrial UV and rot resistant bonded polyester thread.
  • Clean up is easy, hose off or throw in the wash.
  • Built in Bozeman, MT USA.

Occasionally, without notice, manufacturers change product design and/or specifications.

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Frame Bags Guide


Frame Bags Guide

Frame bags are designed to fit onto the frame of your bike. Available in different sizes, these bags both expand the carrying capacity of your bike and are easily accessible on your adventures.

Types of Frame Bags

Inline Frame Bags

Fitted inside the frame of your bike, inline frame bags are the most common type of bag. Particularly for longer endurance rides or multi-day trips.

Inline Frame Bag

Storage Cases

Storage cases are also mounted on the top tube of your frame. These packs usually have a much tougher material compared to other bags and are much smaller/aerodynamic. They are most commonly used in competitions or endurance races.

Storage Case

Top Tube Bags

Top Tube Bags are mounted on the top tube of your frame. These bags make your fuel/essentials easily accessible and are often a little smaller than a standard frame bag.

Top Tube Bag

Universal/Race Straps

Universal straps are used for additional storage. These straps allow you to mount further accessories onto the frame of your bike. The most common type of straps are Velcro, which are easily adjustable depending on frame size and the equipment you are carrying.

Universal Strap

What to look for


Frame bags are designed to strap onto your frame with ease. The fittings are adjustable to easily fit a variety of different bikes. The most common strap used for frame bags is an adjustable Velcro strap, which is specifically positioned on the bag to position the bag mirroring the shape of the frame. Other forms of straps used are rubber/silicone bands that clip around the frame.



The frame bag carrying capacity is commonly measured in litres. The listed measurement is the maximum capacity that the bag can carry. Frame bags vary in size from about 0.5L for the very smallest, all the way up to 8 litres for the largest. The most common size for frame bags is 3 Litres.

The size you require will be determined by the size of your frame. So it is always recommended to measure your frame, to find the correct size bag. You will also need to factor in whether you will have enough room for a bag, due to the bottles you are carrying in the frame.



The materials used for frame bags is an important factor to take into consideration for cycling in the UK. Most frame bags use materials with weather protection, however you will want a fully water-resistant bag to protect your belongings from the elements. Look for fully waterproof materials such as nylon fabric and a roll top frame bag for the best weather protection. The best frame bags have a waterproof zipper aswell.


Delivery & Guarantee

UK Delivery Information

International Deliveries – Temporarily Suspended 11/11/20

Note: We are still offering deliveries to the Isle of Man, Scottish Highlands, Scottish Islands, Channel Islands, Isle of Wight, Jersey and Guernsey. 

Courier Delivery update: Due to the COVID19 situation, we are currently experiencing some delays with deliveries. Our couriers are working around the clock to get your order to you as soon as possible but there is a potential delay of up to 48 hours . Please check your tracking on track your order here.

Please download the TNT Track and Trace App for iOS here and Android here so you can keep an eye on your delivery and any further updates.

Please note on the TNT tracking app it may show your delivery status as ‘Collecting’ (as per image below). This means your delivery has left our warehouse and is currently held at TNT main depot and there could be up to a 48 hour delay.

tnt delivery

Please keep checking the TNT tracking for further updates. On behalf of TNT we apologise for any delay and inconvenience this may cause. 

We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE in the UK, regardless of the size and on all orders over £20.

Please note that bulky products and bikes shipped to outlying UK regions are excluded from free shipping.

Please note that Pre-Order dates can sometimes change due to updated stock information.

Click here for more UK and international delivery information.

Returns & Warranty

It's easy to return a product with our 365 day, hassle free returns. 

We will give you a full refund on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.

If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

For more information please visit our Returns & Warranty page.

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