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The Prospector EP50 (Black)
Perfect additions to The Prospector EP50 (Black)
The Hipbelt Pocket
£22.50
Sticker Pack
£4.00
Description
The Prospector (previously known as The Mo)
It took us 12,000 miles of hiking to design our perfect backpack: The Prospector– a lightweight, fully featured load hauler, purpose built to support you on your next adventure.
We designed The Prospector to suit the average thru hiker using modern, lightweight gear, with a base weight of up to 10kg/22lbs. We use lightweight, durable materials that are easily able to cope with heavier loads and heavier use. If you are heading out onto rough and overgrown trails like the Continental Divide or Te Araroa then The Prospector is for you!
With a load capacity of 19kg/42lbs and pack weights starting at just 910g/32oz for a size Medium, The Prospector won't weigh you down.
Load capacity
19kg / 42lbs
Weight
910g / 32.1oz (medium, medium hipbelt)
Height fully unrolled
82.5cm / 32.5"
Circumference at base
87.5cm / 34.5"
Circumference at top
94cm / 37"
Main body volume
45L
Side pockets volume
2 x 2.5L
The front pocket can stretch to hold up to an additional 5L in volume.
Features
4 inch wide Dual adjustable hipbelt
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.
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.
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.
Hydration tube port
There is an access port behind each shoulder strap, allowing access inside the bag where there is a hanging clip for your bladder.
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.
Sternum Strap
Elasticated and height adjustable.
Ice Axe loop
Sewn-in loop to easily connect an ice axe or walking poles.
Materials
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)
Backpanel
Find your hip measurement
Take the tape measure and wrap it around your hips bones (or where you wear your hip belt). Where the two ends overlap is your hip measurement, use the chart below to find your size. If you are in between two sizes, going for the smaller of the two will ensure a good fit - trust us on this.
| Hipbelt Size | Inches | Centimetres |
| Extra Small | 28 - 30 | 71 - 76 |
| Small | 30 - 32 | 76 - 81 |
| Medium | 32 - 34 | 81 - 86 |
| Large | 34 - 36 | 86 - 91 |
| Extra Large | 36 - 38 | 91 - 96 |
| XXL |
38 - 40 | 96 - 101 |
| XXXL | 40 - 42 | 101 - 107 |
Perfect Hipbelt Fitment
How to measure your Torso
Follow our 5-step guide to find the perfect fit.
Please note!
Your torso size is not necessarily linked to your height or weight. If you take a large t-shirt it won’t necessarily mean your torso is a size large. So please, measure before buying.
Finding an accurate measurement is simple, but you may find it easier if you ask someone to help you measure up.
1. Find your C7 vertebrae
Tilt your head forward and find the bony bump at the base of your neck - this is your C7 vertebrae and the top point of our measurement. Place the top of the tape measure or string here and then tip your head back up to neutral.
2. Find your iliac crest
Place your hands on the top of your hip bones with your thumbs pointing towards your spine. Draw an imaginary line between your thumbs, where this line meets your spine is your iliac crest. If you are measuring on your own, then adjust the waistband of your trousers to sit at this point and tighten your belt - you will measure to the top of your belt.
3. Measure the distance between the two
Measure from the C7 down to the iliac crest (or your belt if you are measuring solo): make a note of the number - this is your torso size.
4. Measure again
A wise person once said, measure twice: cut once. Custom packs are non-refundable, and returns are painful for everyone, so take the time to get this right. Apply a little common sense at this point - if you normally wear Small t-shirts but have measured as an X-Large, maybe let's go back to step 1! If you are unsure, please send us an email and we can help.
5. Torso size
Once you are satisfied with your measurement, refer to the table below to find your size. If you are in between two sizes, going for the smaller of the two will ensure a good fit - trust us on this.
| Torso Size | Inches | Centimetres |
| Small | 15-17 | 38-43 |
| Medium | 18-19 | 46-48 |
| Large | 20-21 | 51-53 |
| Extra Large | 22-23 | 56-58 |
The Prospector
A quick video run-through of the features
Lightweight design. No compromise.
It took us 12,000 miles of hiking to design our perfect backpack: the Prospector – a lightweight, fully featured load hauler, purpose built to support you on your next adventure.
Really enjoyed using the Prospector EP50 on a week's thru-hike (GR221), carrying ~5kg base weight + up to another ~4-5kg on heavy water carries. Handled heavy weights surprisingly well, with only a small issue with the back on heavier days (see below). Spacious enough to carry a lightweight 2-person tent, sleeping system, cooking system, food, water, clothes etc with space to spare. The double-buckle hip belt is great, feels like it can be fine-tuned to fit the specific shape of your hips. My other favourite features are the shoulder strap pockets (great for snacks on the go), spacious side pockets & bottom-side stuff pocket (which I used for rubbish in the small hole on the side and other bits on the larger side). The large inside pocket is spacious & the key clip useful for small things like keys, pocketknife etc. The front stretchy pocket was helpful for any bits & pieces for quick access. The mouldable back was a really nice feature. I found this worked really well overall. Once or twice (after some particularly heavy water carries) the back deformed somewhat and I had to take my bag off and stick a knee into the back to make it more comfortable. But I think worth it overall to be able to shape the bag to your back. Hopefully this doesn't become an annoying feature on a longer thru. I found the bungee cord to be super helpful for drying clothes on my bag while on the move. TBC how well they hold an ice axe, but could get my poles & clothes to be held sturdily.
My main qualm is I wish the bag had 1-2 more small pockets (possibly internal to the main compartment?) to help with organising gear better because it's easy to lose small items & get disorganised, particularly if you don't have many small packing cubes. Though this could be helped my adding hip belt pockets (which I didn't). Overall a really great pack that I'm looking forward to using on a longer thru later this year.
Great build quality and it’s really nice to support a UK company. It’s my first roll top backpack so I’m still getting used to that, I’ve had it out on 3 wild camps in the Lake District so far. I do find the chest buckle a little tricky to clip in but I’m hoping that will get easier with practice, also the hip belt buckle looks small compared to other rucksacks that I’ve had, hopefully I’ll never have an issue with it breaking.
Overall I’m very happy with my pack and I’m sure that the more I use it the more comfortable I will be with it Atb Darren
Currently testing it on the fishermen’s trail in Portugal. Very sturdy, yet light backpack. All the additional pockets are very convenient.
Dear Atom Packs team,
since I've been a hiker for more than 15 years, I used several backpacks before. In the beginning they were big and heavy and the Prospector now is the lightest and smallest. I appreciate it very much! It's made from strong fabrics that will probably last very long. It is well thought out and the details are convincing. It just feels organic - like the backpack and me are glued together in a pleasant way. I can say: it's the best backpack I've owned so far! I can highly recommend it.
Thanks for making such good products!!
As we were hiking and most of the kit left back at camp, the over sized packed worked well for extra jackets/Trousers required for the walk, it packs down really well by rolling the outers.
15 mile Circular and the pack worked well
The stuffer underneath also works well😊
