The Notch EP40 (Black)

If any sizes are unavailable, our next restock will be on September 3, 2024
Torso Size

Perfect additions to The Notch EP40 (Black)

The Hipbelt Pocket

The Hipbelt Pocket


Sticker Pack

Sticker Pack


Typically ships within 2 weeks

Meet The Notch, a compact yet robust thru-hiking pack created to be a resilient companion over thousands of miles of hiking.

The Notch is built on the same core design you know and love in The Mo (the same frame style and hipbelt) but with a few key differences...

  • 40 Litres: A refined size ideal for those with modern UL gear.
  • No Load Lifters: Leave that crutch behind; you don't need them on a pack this size.
  • Webbing Side Compression: Super durable.
  • Extended Daisy Chains on the Shoulder Straps: Clip on more gear.

Load capacity
16.5kg / 36.4lbs

840g / 29.6 oz (size medium)

Height fully unrolled
74cm / 29"

Circumference at base
86cm / 34"

Circumference at top
94cm / 37"

Main body volume

Side pockets volume
2 x 2.5L


4 inch wide Dual adjustable hipbelt. Removable.
Comes with 4 adjusters that tighten by pulling inwards allowing you to dial in the perfect fit. 

Lumbar pad
Made with 10mm EVA foam and 3mm thick spacer mesh.

Plastic Frame with removable Alloy stay
Removable frame sheet made of 1mm thick plastic with a sewn-in 12mm / ½" alloy bar. The frame for a medium torso length weighs 91g of plastic, and 58g of alloy.

Padded back panel
Uses shaped 8mm closed cell foam. Can be removed when the pack is empty for a 25g weight reduction.

S-shaped shoulder straps
Sewn using our own laminated 10mm foam, durable 210d Robic Extreema face fabric and breathable, soft 3mm spacer mesh.

Dual shoulder pockets
Super stretchy and big enough to hold most smartphones, a day’s worth of snacks or a 700ml water bottle. The elastic is fixed and, owing to its clever design, does not need a tensioner.

Roll top closure 
The closure has a 15mm vertical side compression. The roll top can also be clipped together at the top (dry bag style) and the side compression clipped around the front of the bag to aid carrying snowshoes or maybe a huge packs of chips etc.

Z side elastics
Great for securing trekking poles, tent poles or drying your socks.

Bottom pocket
Easy-access bottom pocket with trash port made with Dyneema stretch fabric.

Large front pocket
Made with Dyneema stretch fabric. Can hold 5L, not included in the total volume.

Side pockets
Two 2.5L forward-facing, deep and low side pockets made with 210D Robic Extreema. Each one is big enough to keep 2 x 1L Smartwater bottles steady, yet low enough to reach whilst the pack is worn.

Front zig-zag elastic
Removable and designed to be able to store a folded Z-rest or assist with air drying your clothes.

Side compression webbing with adjuster
These are there to secure a trekking pole or tent poles when stored in the side pocket.

Sternum Strap
Elasticated and height adjustable. Whistle.

Ice Axe loop
Sewn-in loop to easily connect an ice axe or walking poles.


Ecopak EPX200
Body and base

210d Robic Extreema
Side pockets, shoulder straps and hipbelt

Dyneema Mesh
Front pocket and bottom pocket

500D Textured Nylon (similar to Cordura)


The Notch EP40

Get a quick video run-through of the Notch from Tom.

The Notch

Small volume, big miles.

The Notch is a compact yet robust thru-hiking pack created to be a resilient companion over thousands of miles of hiking.

Customer Reviews

Based on 3 reviews
John Burrow
Atom Notch

Used my new Notch for 7 days on my first section of the Pennine Way from Edale to Dufton. Found the sack to be light, very comfortable over long days and good quality considering its light weight. Only things that bothered me a little are the sternum strap as I feel the clip would be better positioned in a central location rather than located next to the shoulder strap which makes it awkward to uncle, and the double adjustment set up on the hip belt when a single system like other Atom bags would be easier to adjust. Still a fantastic bag which I look forward to using soon when I finish the PW.

Top Notch

I recently used the Notch on the West Highland Way and for a two-day trip at Mont Blanc, and I must say, this bag is incredible. The design is well thought out, and it easily accommodated all my gear. The build quality is top-notch, making it highly durable for tough trails and varying weather conditions.

The customer service from Atom Packs is absolutely superb — they were responsive and helpful.

I’m confident this pack will hold up for a long time, but if I ever need another one, I wouldn’t hesitate to order from Atom Packs again. Highly recommended!


Incredible bag designed by an amazing company and the service is second to none. Can’t wait to buy another one!