The Roo (Zero Waste)


Typically ships within 2 weeks

In town or on trail: you decide. 

Say what you like, Bum Bags are back and this time they are here to stay.

The Roo is our go everywhere bum bag, designed to be used either on its own, or as a compliment to your backpack when out hiking. In town or on trail: you decide. 

The Roo enables you to have everything you need, right there at your fingertips.

We use offcuts of fabric from our backpack production to make these, so each random Roo is completely unique.

Available in two size and colour options, The Roo is ready for action.

Zero Waste
These are hugely popular, and for good reason!

Multicoloured (Random) - exclusively sewn from offcuts and are sold as a lucky dip (no colour requests, please). The panels will likely be made out of multiple fabrics and colours, and our aim is to create a unique piece that minimises waste created from our other products.

Black - The Roo for any occasion - tactical, classy, wears well with a suit.

Made from a mix of fabrics (mostly EPX200 and VX21), with a 20mm soft feel nylon webbing strap, a Lycra powernet stretch pocket and YKK 5mm aquaguard zip.

The Roo's waistband circumference can be adjusted up to 120cm / 48". 

 Standard Large
Volume 1.5L 2.5L
Width 20cm / 8" 20cm / 8"
Height 13cm / 5" 13cm / 5"
Depth 6cm / 2.5" 8.5cm / 3.3"
Weight 96g / 3.35oz 100g / 3.5oz

Please note we are not able to accept colour requests on this product. 


Large zip
Large (5mm) YKK aquaguard zip opening allowing easy access.

Deep side panels
More usable space inside the pack with 5cm / 2.5" deep side panels.

Stretch front pocket
Lycra powernet stretch front pocket with rolled over elastic. Good for lip balms, sunscreen, trail bars, etc.

Internal sleeve pocket
Low profile internal sleeve pocket. Good for organising smaller items like bank cards, valuables etc.

Key hook
Handy for securing your keys, the hook is fixed inside the opening.

Soft feel strap
The 20mm soft feel nylon webbing waist strap secures to a side release buckle on the wearer's right-hand side.

Water resistant
Whilst the Roo is built using waterproof fabrics and uses an aquaguard zip, it is not seam sealed. Some water could ingress in heavy rain - you should always protect your electronics.

Customer Reviews

Based on 15 reviews

Matches my backpack in colours. Ideal.


Well made lightweight bit of kit. Definitely using on my next hike.

Good little bag with one annoyance

I haven't used this yet but the design seems good. It's only marginally bigger than an REI fanny pack I have but the design provides much more usable space. I'm excited to use it on the trail with my ULA pack. The colors are okay. I could think of worse combos but not a fan of the hot pink next to red and then there's a hint of a red, white, blue theme going. But overall the colors are fine, not deal breakers. The annoying thing is that the waist strap has no keeper, or whatever you call the little elastic band most things like this have to contain the extra strap. The strap is so long I have a tail that dangles 18" and nothing to keep it out of the way. I guess I'll trim it but it'll still dangle to some degree. That's an important design feature that's missing.

Great little edc bag

I've got this in Large-size along with the Mo last year. It's a good size as an edc during warmer periods to have my small camera, wallet and accesories needed, usually even a small 100g windjacket in it. Also good when hiking as it can be used in camp and during hiking i sue it for the camera and snacks, phone and those handy to reach stuff. Quality is good and as always Atompacks UK was super helpful and great to do business with.


Received this as a birthday present and I’m so pleased (got lucky with great colourways). Trying it out today as I continue walking the Ulster way and already it’s perfect for my phone, snacks, fits perfectly under the waist belt of my pack. Thank you!