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Big Papaexpedition seat pack

Durable 17 litre capacity seat pack for expedition riding. Secure, stable and UK made

Big Papa expedition seat pack

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    Flo Orange
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The Godfather of seat packs! This 17 litre beast will carry kit all day long with no sweat.

Based on our original Koala but made larger for longer, more remote rides. Koala has been to the gym and come out stronger, albiet it at the cost of a few extra grams. We have beefed up the attachment straps and reinforced the contact points to fend off wear. Super tough Cordura wraps around the base of the pack for durability and we have added a cord triangle to tie down your waterproofs or flip flops. A tough aluminium buckle adorns the top strap so you can synch everything down nice and tight for a stable ride.

Made from durable and highly water resistant VX21 and 1100d Cordura.

When will the Big Papa be back in stock?

"When can we get ourselves a Big Papa!?" you cry! 

We're super picky about the fabrics that we use for our UK made bike luggage, so we're currently waiting on a delivery of the best fabric we could find to make the next batch of Big Papas. It's a super busy time for our factory at the moment so we won't be able to give you a firmer date for the time being, but watch this space: they'll be back soon, we promise!

Key features
  • 25 Year Alpine Bond
  • Made from durable and highly water resistant VX21 and 1100d Cordura
  • Roll top closure
  • Made in our own UK workshop by bikers, climbers and paddlers
  • Reinforced at all contact points
More images
Vital stats

Length: 50 cm
Width:  18 cm
Height:  18 cm
Weight: 368 g
Max capacity: 17 litres
Minimum clearance needed between saddle rail to the wheel:  22 cm
Minimum length from base of seat post to saddle: 16cm

Origin: United Kingdom

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.
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8 Reviews


Used this product?

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Lone Red
BIG PAPA seat pack

First impressions- EXCELLENT!
Bombproof feel and construction to this product. Stitching quality is excellent with no loose raggy ends. Buckles top notch and the open aluminium style is a great time saving idea.
I look forward to stuffing my hammocking sleeping bag into it and updating my review next week.


This has been used on three bikepacking wild camps so far with various combos of kit packed into it.. This has included:
British army bivi bag, Exped synmat winterlite LW,lightweight down jacket,inflatable pillow.
DD hammock,and suspension straps/carabiners,Exped mat,above jacket and pillow.
DD jura2 sleeping bag by itself.
Make sure the available strap crossover under the saddle rails to prevent sway.All in all, a great seatpack.

Great cost-effective product

I normally don’t write reviews but this product deserves one. I spent a lot time researching online and found that all available products were really expensive. Luckily I found this great company and this saddle bag. I needed a 17L bag and this was perfect. I bought it online and sent a couple of questions via email. The company was responsive to answer, the product arrived as expected and the quality of it is great. I just finished a four-day bike pack tour and I even felt the bag was attached to my saddle, it holds really tight, it offers an extra front strap to hold better, it is easy to mount/unmount and also easy to open to take things in and out. Very Happy with this purchase and it cost me 40% that the most publicized products. By the way during my tour, I use this bag together with the 13L Dry Bag for my handlebar.

Simple Great Product and Great Company!

Big Papa

This product was recommended to me and I was not disappointed I used it for a weeks cycling doing the NC500 so neat and I couldn't feel it on the bike, no movement at all. The company delivered on time very prompt and efficient.

A well designed tail-pack...

Excellent tail-pack for overnight trips. Very stable even when packed with my tent sleeping bag and mat. A minor gripe is the length of the Velcro straps - on my bike I only get ~15 mm of overlap. Another 20 mm of strap length would make things more secure.

Excellent bag with color matching my bike

The bag is solidly built with wide color range, I immediately bought one when I saw it available in yellow which perfectly matched my bike.
Most the straps are well built and offered plenty of adjustability except for the seat post straps which are way too short for my Trek bike. I have to cut some Velcro strips for extension. However, since I use the bike for daily commute between office and home, so the strap extensions should be no issue except for the look; for that only 4 stars.

Philip Malcolm
Sturdy, Roomy but flawed

I've been using the Big Papa since May for overnight bivvies, one long day on the road and an Ultra MTB event. In terms of capacity, it's excellent. I've had variously my sleeping system and enough food to kill man, 2 days clothes and my shower gear and all of the above in various combinations in there. It cinches up tight and fastens on securely.

There are downsides, however. The Velcro straps could be longer to remove the rub on clothing when riding and keep the bag more secure. When you tighten the buckle straps through the saddle down it has a tendency to pinch the pack in the middle, causing the back end to sag towards the wheel. Finally, the trailing strap on the aluminium buckle is far too long and finding somewhere to bundle it up out of the way is a pain. There was one occasion I was rudely deposited trailside after it bounced free on a rocky descent in the Ardennes and wrapped it's way between my brake disc and hub stopping the back wheel. On this occasion, however, the pack was not enormously full and maybe that contributed to the strap having so much spare.


Poorly designed velcro fixing caused a hole to be rubbed through my shorts on the first outing. Alpkit modified the bag but offered no goodwill gesture for my damaged kit, despite me heavily documenting the case. Big Papa still at prototype stage.


“Thank you for your review. We have passed your feedback directly to the Product Design team for consideration in future designs. In the meantime, I hope that the modification has made the Big Papa more suitable for your requirements. Please feel free to contact us at support@alpkit.com / 01773417007 if you need anything else.”