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Gourdon 20waterproof back pack

Waterproof 20 litre roll-top drybag with bungee straps and mesh pockets for added capacity, ideal for anything from adventure races to the daily commute.

Alpkit Gourdon 20 day sack in black
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Simple is a complicated design brief. Just a drybag with straps?

We made Gourdon durable and waterproof because we wanted a go anywhere rucksack and our customers have really taken this to heart. Gourdon 20 has been used at over 6000m, taken part in adventure races and seen a lot of canoe journeys. Some people have even used it to just walk round the park with the dog.

As a day bag Gourdon 20 is the perfect volume - it swallows a big lunch, waterproofs, jumper and space for all those little things. The single roll top opening keeps everything inside dry and secure - more than any other rucksack we’ve tried.

Gourdon gets used day after day; it has a removable stiff back pad, comfy foam mesh padded straps, a waist belt and chest straps. Wear it all weekend; biking one day, on the hill the next and commute to work on Monday.

Not content with Gourdon being an extremely versatile bag already, we added mesh pockets for easy access to your water bottle and snacks on the go. Elasticated straps let you attach anything you want on the outside - from a wet waterproof to little Tommy’s cuddly dinosaur toy.

Key features
  • 3 Year Alpine Bond
  • Pouch for 1 l - 1.5 l hydration unit (450 mm long by 200 mm wide bladder)
  • Twin mesh side pocket fit std cycle water bottle and smaller Siggs
  • Roll-top waterproof closure
  • Removeable padded back
  • Elasticated accessory cord
More images
Vital stats

Fabric: Taslan TPU nylon
Taped waterproof seams
Duraflex buckles


Total weight: 470 g
Removable back insert: 72 g
Height (laid flat): 50 cm
Width (laid flat): 32 cm

Origin: China


OMM - lightening the load with Johnny P’s Mountain Marathon kit list

Johnny P makes some suggestions on lightweight kit suitable for the OMM


What a Difference a Day Makes

We run, we climb, we bike, we hike, we swim, we paddle. Why not do them all at the same time?


Just Keep Swimming

Support Hero Connie gets ready for chatting to customers at Manchester Swim Expo '16 and talks about her move in to wild swimming


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Free UK Shipping on all orders

Free 2 day delivery to UK addresses is included in all orders so the price you see is the price you pay. Upgrade to next day at the checkout.

Free No hassle 123 Day Returns

Buy with confidence and if you are not happy, change your mind or want a swap for any reason then return it for free and we will exchange or refund no question. The price you see is the price you pay. Just return the kit as you receive it - in its original condition, unused, unworn, with original packaging and fit for resale.


We offer a range of finance options from 0% to 9.9% starting on orders over £500. Please give us a call on 01773 417007 to apply for finance. Our customer support heros will take your order and talk you through the quick and easy application process.

Alpine Bond

If one of our products does not meet your expectations upon delivery or, if it does not live up to the demands placed upon it, please return it within 3 years of purchase for repair, replacement or refund. If the problem is our fault then we will do this to your satisfaction if it’s your fault then we will help out the best we can.


37 Reviews


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Still going strong

Have now used the Gordon 20 for 18 months 5K miles commuting, never let in water, straps very comfortable, survived being scrapped down the road during a crash, mesh pockets a great size for bottle, gloves etc....The yellow has faded a little, Been great value so far

Top product

I've had the 20 for years now (probably more than 4, it has been so long I can't remember) and use it almost every day for mountain biking, commuting, climbing, shopping, sledging etc. Well happy. It is perfect for me- just the right size, light, simple and effective. It has had a hard life, has been all over the world and has a few small holes in it from all the abuse it has taken but is still going strong.

All in all it is an excellent bag and that's without considering the price. Bargain

Great product and service!

Put my order for a 13l tapered dry bag, a gourdon 20 backpack and koala straps last saturday and received the items this wednesday (even with a personal note!).

First of all great service!

Second, the backpack looks and feels amazingly good!!!!!!
I have tried to attach the drybag on my bike, but it is a little bit moving around. I will look for further solutions and if that will not work out, I will certainly order the Koala!

Third, I will certainly will buy more Alpkit items in the future!

Mike L
Excellent bag

Bought this pack 4 years ago, to use for daily bike commute.

Its light, comfortable and surprisingly spacious and endured all manner of weather conditions in those 4 years with aplomb.
It has been completely waterproof and the material is very flexible unlike the usual tarp type roll top bags seen.

The mesh pockets are handy and being deep have no worries about items coming out whilst walking or riding.

Was fortunate enough to get one of these in a bright fluro yellow for £25. Massive bargain.

Apart from some colour fading, the rest of the bag is still in great condition. When mine wears out will definitely get another.

Only drawback is the lack of brighter colour options.
Bring back orange and yellow fluro!

No nonsense backpack.

This is the 3rd bit of kit from Alpkit, and again they have nailed it. A product that works. Packed correctly can hold an entire days kit with ease. It's waterproof with no flapping about cover. It's comfortable and even has a removable pad to sit on when you stop for lunch. Price point is great like all Alpkit stuff. I buy kit on a regular basis and I can guarantee more purchases will be made with Alpkit. Great products, Great company values.

dave knowles
great MTB backpack

Bought this for mountain biking in Torridon. Hard to beat. Its light, comfy, waterproof and roomy.

Versatile and trusty.

I've had my Gourdon for nearly 4 years and it's still as good as the day I got it. I've used it on my daily MTB commute for the last year and a half, it's never let a drop of rain in (it's even survived a few accidents). Before that I used it as my rucksack at University, carrying books and a laptop every day. Since day 1 it's also been used as a day sack in the mountains around the UK, a weekend bag and it's even been abroad a few times! These bags are so versatile and I trust it to keep my things dry every time. Everyone should own a Gourdon!


Nice job mates! Super fast shipping to the Czech republic!!! I love this pack. I will disseminate your cool brand here in central Europe:)


Easily the best bag I've ever bought, water tight, super light and comfortable, easy access, super durable. I've used this bag every day for the past 4 years, no rips, no snags, it just keep going.

Great bag

I bought this bag to use on my cycle to work, but ended up using it all the time. I just love it. Would love it even more if it had inside pouch or attachment hook.

Stephen Williams
Great Wee Bag

Really pleased with the bag, bought it to replace my cycling bag and it fill the need perfectly. While it doesn't have all the nice compartments of my last bag the large opening makes it easy enough to navigate the internals and find what you need.
We have also used it for walks as a family and it preforms well, my back gets a bit sweaty but thats to be expected from a day sack of this type.
The fact it's waterproof it great, my last bag would fail on the zip line needing either a dry bag inside our an outer cover, neither of which are a great solution.
This just works and at a great price! I hope Alpkit keep producing it incase mine ever gets damaged so I can get another.....

Every day

I've had this bag almost a year and have used it for commuting by bike year round, race day necessities, and carrying groceries. At 20l, it's small enough that it doesn't feel wasted when empty, and is surprisingly large when I need to carry extra gear. Best bag I've owned.

Festival staple

The Gourdon is at the top of my checklist for my yearly weekend pop festival - Indietracks. It is very lightweight and comfortable to wear, even for a short person (5' 4"). I love that I can chuck whatever I want in it without fearing the inevitable rain. Without it, I probably wouldn't risk taking my camera, and would have missed some fantastic shots over the years.

Tom Kennish
Best Rucksack, best customer support

Had a problem with the rod that the chest strap clips to. On our way back from Scotland we stopped off at the Ambleside store, walked back out with a replacement in 2 minutes. Awesome people.

Endee M
Gourdon Brown, Texture, Like Sun

Brilliant in every way. In fact, my better half has asked me not to keep going on about it's comfort, great design, good size, great waterproofing...
Props to the team in the Ambleside shop too, lovely bunch & very helpful.

Ideal back pack

I bought this back pack for a trip to the peaks. I need something more than your usual CamelBak. I had plenty of space for all my gear and carried a 1.5 litre bladder, great little touch having a pocket for that. It was really comfy throughout the ride and distributed the weight evenly. The only mod I made was to place a clip on the lower part of the shoulder strap to retain the drinking pipe for the bladder. Still rate the pack as a 5 star. Superb.

Jim L
Best cycling bag I've ever owned

Been using this for a year or two and it's without a doubt the best cycling bag I've owned.

100% waterproof. Bulletproof. Comfortable.

Never going back to the usual cycling hydration packs.

Buy one. You won't regret it!

Very Durable

I bought this pack to replace an old $10 backpack that survived five years of college. At first, I was hesitant about switching from a generic black backpack with tons of compartments to a flashy red pack with one chamber. Since making the switch, I haven't gone back. My favorite features are:
- waterproof roll top
- water bottle holders on both sides
- simplified storage
- super lightweight
- padded straps
- velcro compartment can fit a 2.5 L hydro pack

You just can't get a backpack this versatile, lightweight, and waterproof for such a small price tag. Everyone should have one of these.

You need this rucksack

Quick story:

I've owned a 22l rucksack from Osprey for 8 years. It's served me well on hundreds of commutes and numerous extended road trips.
Then I saw the Gourdon (two of my close friends both purchased one in the same month). I liked it, but I didn't need it.
Then someone bought me one for my birthday. Nice.

One short road bike commute (10 miles), one long road bike commute (50 miles) and one long run home (13 miles) and the Gourdon has shown itself to be light, comfortable, a great fit (I'm average build and 5'11) and as a bonus, it's a dry bag!!!
£32? Buy one. Buy your friends one. Buy you dog one. This rucksack is THE rucksack and you need one in your life.

Banana Hammock
Brilliant piece of kit

I use this all the time, from cycling in the rain, to wading through swamps, to going on diving trips through rough seas. Nothing has ever got wet inside it. It is comfortable and spacious. I even used it as bucket once, since it is obviously waterproof from the inside too. My mates are always jealous of it and ask me where I bought it. It's gone up in price since I bought it for 20 quid about 7 years ago, but it's still an amazing bargain.