
Overview
The Atompacks Prospector (formally the Mo) is an ultralight backpack with a single main section and between three to eight external pockets depending on what you specify. It comes in three capacities 40, 50 or 60 L volume. Of this total volume, each side pocket is said to hold 2.5 litres, but in reality you are likely to use them to support taller items which protrude from the top, thus actually having a much greater volume. The packs come in three back lengths and with three sizes of hip belt so you can be sure to find one that fits you well even if you are an unusual combination of height and girth.
The sacks have a roll top rather than a lid so you lose the pocket you would normally find in the lid. Whilst made from a waterproof fabric, don’t let this and the roll top fool you into thinking the pack is waterproof like an Ortlieb pannier, because the seams are stitched rather than welded and are not seam sealed. You will still need a pack liner or cover to keep your kit dry – as you do with almost every other pack on the market.
An aspect that makes these packs unusual is that you can both buy a standard specification, or you can custom design a pack and alter the colour, pocket combination and strap arrangement to suit your needs.
What makes Atompacks ‘Ultralight’
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The main fabric is a 200 g/m2 sailcloth rather than 500d Cordura at 250 g/m2
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Roll top rather than snow skirt, lid and lid pocket
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Single main section
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Lower amount of webbing straps
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15 mm webbing straps rather than 19 mm
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No zip closures
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Elastic cord for side compression rather than straps and clips
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Waist belt based on two 15 mm straps rather than one 50 mm strap
Why did I buy one / what are they best for?
I wanted a 45 L pack for 2-3 day self supported three season backpacking adventures. For weekend micro-adventures I enjoy being able to cover longer distances ‘fast and light’ and I wanted a smaller and lighter pack for 8-10 kg pack weights. At 990 grams, my 50 L Prospector is a significant 1300 g lighter than my Macpac 55 L pack. I also wanted something simple, ideally just one main section and one pocket – with customisation one can get close to this.
I’ve used mine on two short trips so far and whilst I have found it extremely comfortable, I suspect I would not want to use a 60 L model with the 12-15 kg more common with winter backpacking trips.
Design features – description and effectiveness.
Fundamental weight weight carrying design
The Prospector has a plastic frame, kept rigid with an aluminium stay down the centre. This is padded with closed cell foam for comfort. Load lifters, work with the frame to enable you to adjust the proportion of the pack weight which is carried shoulders vs. hips. Weight is transferred to the hips via 100 mm wide padded hip belt with novel dual adjustment straps which independently adjust the tension of the top and bottom of the hip belt. Whilst the two 15 mm straps look very flimsy against the ubiquitous 50 mm single strap design, the end result is the most effective hip belt I’ve ever experienced. Having the ability to hug the belt above and below your hip bones mades it possible to effectively transfer the bulk of the pack weight to your hips without the hip belt having to be uber-tight. Additionally the straps are tightened by pulling inwards rather than outwards which makes adjustment so much easier to achieve.
The above system works supremely well, making this a highly comfortable pack to carry. Some might argue that a frame is not necessary with this size of pack, but do not under estimate how much easier it is to pack a rucksack with a rigid back vs a floppy bag with shoulder straps. This becomes of even greater value when you are seeking to pack your bag inside a small tent. Critically, having a frame allows the use of load lifters, and I learned by painful experience ( Severe trapezius pain carrying the Auguille Bora ) that load lifters are another key facet to a comfortable multi-day pack for me. Whilst their primary purpose is to adjust the weight loading between shoulders and hips, they allow for you to correct for any asymmetry in your shoulders. Whilst I may be unusually wonky (!), statistically it is unlikely that the majority of people are wholly left-right symmetrical and thus most people could probably benefit from load lifters
Take home points: Supremely comfortable pack for 8-10 kg. Frame also makes packing easier.
Pockets
The standard pack comes with two side pockets (2.5 L each), a stretchy pocket on the back, with criss cross bungees over this to carry (dry out) wet items and an unusual stretch pocket on the base of the pack. There is also a stretch pocket on the front of each of the shoulder straps designed to take items up to a 700 ml bottle.
Side pockets – to say these hold (only) 2.5 L is rather misleading, because it is very likely that you will use these deep side pockets to carry items that extend far out of the top of the pockets too – items such as a tent or tall water bottles or a pair of walking poles. I’ve easily stowed my Hilleberg Enan in one of these side pockets. (Out of interest I found I could also get my Soulo into a pocket too, but something of this weight would be better strapped to the top of the pack.) Alternatively, each pocket can hold 2 x 1 L water bottles. Remarkably too, these pockets are positioned so you can easily access them on the move so I have used the second pocket for hat and gloves.
Mine is a custom pack and I did not opt for the bottom stretch pocket. The rear stretch pocket is best filled once the main pack is already full and will readily take a Gore Tex jacket plus several small food items.
I saw having to accept the lack of top pocket as something of a compromise, but I’ve actually found my substitute solution far more convenient. For me the top pocket of a backpacking rucksack is used for small items (so they don’t get lost in the main section) and urgently needed items such as head-torch and first aid kit. I now use a 6 L dry bag for these items, which I stow at the top the pack. In reality most of what I once carried in the top pocket is stuff I need overnight so being able to pull out a single dry bag and fling into the tent is actually rather more convenient. Small food items fit into the stretchy back pocket with my waterproofs.
I opted for just one stretch pocket on a shoulder strap. I wanted to leave the webbing free on the other strap to hold my inReach tracker and a clip for my hydration hose. The stretch pocket is excellent for holding a phone (when it is not raining) or a Garmin GPS when it is. The unusually narrow shoulder webbing proved a challenge on my first walk as my hydration tube clip is designed for standard 19 mm (¾”) webbing and kept slipping off the narrow webbing used by Atompacks. Fortunately I’ve come up with a solution to this, using a pair of cable ties.
Other features
The pack comes with a Y strap to hold items onto the top of the bag. I’ve used this for my sit pad, but would also be excellent for holding a winter tent, jacket, baguette or other bulky item. There are Z shaped bungees on the side of the pack, but I would suggest you would be better to have the optional webbing straps in their place, because the side pockets are so deep that you only really need one strap high up for very tall items such as a tent or poles. Webbing straps offer much more flexibility at very little extra weight.
Hip belt pockets can be bought and fitted as an optional extra. There are webbing loops on the hip belt to clip these to, to prevent them slipping off. I found that my existing Aiguille pouches fit perfectly and can be secured to the loops with climbing cord. Whilst I am generally ‘anti-pockets’, I do find a hip belt pouch useful to have batteries and snacks accessible on the move, but I may try without a pouch on my next trip since I’ve found that the existing side pockets are so easy to access on the move too.
There is a clip inside the pack to hold a water bladder and a port on either side of the pack to feed the hose through. The sternum strap is rather unusual, in that the female part of the clip is attached directly to the shoulder strap and not on the end of a short length of webbing. The clip is thus obscured by the shoulder pocket and clicking it in place is a fiddly new skill which has taken time to acquire.
Take home points: The side pockets are very function flexible. I would have preferred side straps to Z bungees
Conclusions
My primary goals were for a simple, lightweight yet supremely comfortable pack suitable for 2-3 day backpacking / wild walking adventures. Because Atompacks offer customisation I could strip off unnecessary pockets so that ticks the ‘simple’ box and the pack has proved extremely comfortable when carrying 8-10 kg for 6 hour / 15 mile days. I am sceptical how comfortable it would be were you to to carry it’s alleged maximum capacity of 19 kg but that’s just a gut feeling for now. I would advise anyone buying an Atompack to opt for the webbing straps on the side rather than the Z bungee because the Z shape seems to add hassle without adding any benefit. As for the robustness of a pack made from lighter materials, only time will tell, but with my previous packs it has been the hip belt which has worn out first, and on Atompacks this part is easily replaced by the user.




This pack would hold my wild walking / camping kit for three days without being rammed full. I don’t consider it practical to have pack which is only just big enough as this usually means that your kit will only fit if it is packed perfectly which takes time, memory and limits your flexibility to change what is at the top of your pack to suit the weather.
Sadly, now we come to the major weak link for this pack. I found carrying 8-9 kg of kit very uncomfortable for more than half a day. On my first walk along the Offa’s Dyke Path one of my shoulder muscles was so sore that I stopped for a sports massage on my penultimate day. After this experience I went back to Aiguille to check I really did have the correct sized pack. They advised me that I had the shoulder straps too tight and showed me what they considered the correct way to adjust the shoulder / hip belt straps on a pack. Whilst they seemed very knowledgeable, were very willing to help and their method is something I have subsequently verified, I will have been adjusting all the different packs I’ve had over the past 35 years using the very antithesis of their advice and not suffered any such shoulder pain before.
Titanium cooking mug – I can both boil water in this and drink tea from it. If I take freeze dried or dehydrated (the former tends to be more tasty) food then my cooking mug never needs washing out because I eat out of the pouch. Thus I don’t carry any cleaning stuff either.





A game changing feature of the Lofoten is being able to use the door as a tarp which gives you covered space to cook under, so long as the wind is not too strong (≤ 20-25 mph).





















version for two reasons (1) The one I tried leaked badly around the cap seal (2) The neck thread is not the 28mm size which you need to fit directly to