THIS SITE USES GOOGLE ANALYTICS TO ANALYSE TRAFFIC. CONTINUING TO USE THIS SITE MEANS YOU ACCEPT THE USE OF COOKIES.WE DO NOT COLLECT PERSONAL DATA LEARN MORE OR SEE OUR PRIVACY POLICY
SEVEN DAY CYCLIST
CYCLING, BUT NOT USUALLY RACING
LATEST UPDATE FEBRUARY 1st 2026
HOW DO WE REACH THE OVERALL RATINGS FOR PRODUCTS WE REVIEW?
SKS Infinity Urban Trunkbag XL
1800g €109.99 (£95.99, at time of writing)
The SKS Infinity Urban Trunkbag XL is a well-made rack pack with “expandable capacity” in the form of two dropdown panniers hidden away in the side pockets. Add on some other nice touches, and you have a highly effective bit of luggage suitable not just for urban cycling, but with the flexibility to adapt to days out with space for a hearty takeaway and a beer or four when getting close to home. I’ve one reservation, but overall this has quickly become a go to for commuting and day rides – even a long-weekend.
Pro: well made, large main compartment, neat dropdown panniers, variety of mounting options, top net, highly water-resistant, waterproof cover, internal organising nets, shoulder strap, bottle holder.
Cons: no light loop.
Specification
8 litres capacity in the main compartment, plus two drop down panniers, each 9 litres, makes for a handy 26 litres max. True, the dropdown panniers aren’t going to take the weight that your regular top-rollers or Velobins or whatever you have. However, they do offer a lot of adaptability. Stowed in zipped side-pockets, the panniers are secured to the rack by a clip and D-ring. They’ll resist rain, but I’d tend to have a plastic bag or two handy to keep things dry.
​
​When folded away, you have a rack pack, or trunkbag. Again, this resists water, so a rain cover included in the package. Bright orange, so good for visibility, too.
Internally, there are a couple of mesh-pockets (for small items), and a divider that can be used to split the compartment into two, or left flat to give a bigger space. A light blue lining makes it easier to spot errant bits and bobs.
Externally, the two side pockets could hold small items, but are really the home of the panniers. However, there is a bottle holder at the rear, with a drawstring closure and drain hole, and a cord net atop the lid.
The kit is completed by a sturdy shoulder strap, an adjustable strap to secure around the seat post or tube, and two Hypalon Velcro straps. Hypalon is a synthetic rubber often used in marine applications, with strong resistance to chemicals, ultraviolet light, temperature extremes, and more. This is backed with good old Velcro to complete the straps for securing the pack to the rack. There are other options, but more of that below.
A two years warranty suggests confidence in construction. It is, indeed, very well made, with smoothly running Easyzip zips, very tidy stitching, reinforcement in appropriate places.
It is a relatively squat pack – my Zefal and Oxford rack packs stand taller – the former has a roll top closure, too - and have taken some carful packing and securing due to the short seat post clearance on my traditional machines.
Mounting 4/5
Before getting onto the practicalities, apart from the Hypalon straps, the Trunkbag is compatible with SKS’s own Universal Rack system, via their MIK (mounting is key) system. You need to buy the bolts and adaptor plate separately. SKS state that the bag is also compatible with other systems; AVS, MonkeyLoad, Racktime, XLC CarryMore / i-Rack and KLICKfix. I have not tested these.
For context, I’ve used a single tier Tubus rack, a two tier Tubus rack, an Avenir rack with a full top-plate, and a venerable unbranded model. None have offered any problems to the two broad Hypalon straps. These slide through the loops on the base of the bag. It took my ageing brain a little while to work out which side up they went, but it won’t test the intellect too harshly. Once in place, pull through the buckle and secure. Easy and, very effective. As one would hope, there’s been no sway or loosening of the bonds that tie.
SKS suggest that these could be shortened, but I’d certainly not cut them down to size, unless absolutely certain that they were going to be used on a single rack and never ported between different models. In any case, the shaped ends make slipping through the slots easier.
Care and durability 3.75/5
I have found a wipe over with a gentle bike cleaner or damp cloth is sufficient to clean dirt off the main trunkbag. I tend to use mudguards – fenders – on all my machines, so the base tends not to get too dirty; if you don’t, try not to forget it. The panniers will accumulate dirt, especially if, like me, utility rides often involve cycle tracks with crushed lime or mud-pack surfaces. If they do it is a good idea to get that cleaning done before putting them away and making sure that they are dry. In my experience with these, mildew will develop if they are stowed damp (not that I’ve let this happen in the case of the SKS Infinity). Likewise, if the interior of the bag is left damp, mildew will appear. Empty the bag, leave it open, let it dry, if dampness gets a hold. I have found GTechniq’s Tri-Clean, to be very effective in dispelling any build up. I’d include the bottle holder in any cleaning routine, despite the drainage hole.
Overall, given the surfaces, I’d say that cleaning is easier than with the Oxford T 18, but that may not be a decisive factor.
Fact is that, properly mounted and short of plunging into the undergrowth, a rack pack – aka Trunkbag – shouldn’t be under threat from the usual culprits. Build biong reassuringly sound, I’d expect these to last a good long time. The main threat may be overloading; the rigid construction has a degree of flex, but in my experience, taking this too far is not a good idea (sad to say, I have, in the past, split the internal fabric of a rack pack by squeezing in a D-lock that was a tad too wide to sit comfortably.
Capacity 4/5
Longer day and Audax rides have recently been catered for by my very reliable Zefal Z Traveller 60 Rack Pack. It’s held all the necessaries for a day ride, including waterproof top, small D-lock etc. It does not need to do more because I can
pack reliably for that sort of ride. Bit of a tangent there, but I was concerned that the Trunkbag would not work so well – I’d prefer not to have drop-down panniers when gadding about on an all-day ride. True, it took all the necessaries with the rain-jacket packed on top in the net. Even so, I’ve tended to pair it with the oversized Zefal Z T3 Top Tube Bag. Jusst about an ideal combination for a guy like me who tends to the kitchen sink school of thought.
The good news is that the drop-down panniers have allowed me to respond to the text that almost inevitably arrives directing me to fetch milk, or a take-away, or those flowers and bottle of wine when the ride has been longer than expected.
The side pockets can take a few small items, although they are mainly there to stow the panniers when not required.
Performance 4/5
Flooded road, massive pot-hole, drinks bottle expelled. Mind you, it nearly launched me out of the saddle, so I’ll not hold it against the Trunkbag. Nor will I blame it for the bottle rolling back into the inundated pot-hole. Dignity recovered, I pulled the drawstring tighter. That adventure apart, life has been reassuringly dull with those Hypalon straps holding fast against all challenges. I had initially wondered if one of Tubus two tier model’s relatively narrow top tier would prove secure, given the broader base of the Trunkbag compared to other models I have used. Although the straps protruded alarmingly and there was a little flex, my fears have been unfounded.
The waterproof cover works well, and adds a bit of brightness on dull days. Properly used it hasn’t flapped around in the breeze much. Mind you, I’ve only used it when things have started to get really wet; it is not always necessary. Of course, it does not cover the drop-down panniers, so plastic bags have joined the kit when heading out on potentially wet days when they might be required. Again, It edges the Oxford T 18 on water resistance.
I love it for day rides, so great for Audaxing etc, whilst that potential for additional capacity offers hostelling or credit card touring without going absolutely minimalist. Having said that, remember your plastic bags if you expect rain.
Value 3.75/5
The Oxford T Series T18 Rack Top Pack is £54.99; not waterproof, no cover, but with carry handle, light loop (yay!), bottle holder, single compartment, 10 litre capacity main compartment, plus two four litre panniers. As ever, it offers a lot of value for money. Whilst it lacks some of the sophistication of the SKS Infinity, and is, in my opinion, likely to be a tad less durable, it is a worthy bit of gear.
Zefal’s Z Traveller 80 offers a whopping 32 litres capacity with its EVA reinforced drop-down panniers. Coming in at around £85, it offers water-resistance and comes with a rain-cover for additional protection. It has that light loop that I boringly bang on about, but the height of the pack would make it problematic for my machines, if not for yours.
The Topeak RX TrunkBag DXP has a smaller max capacity, a weather resistant coating, and costs a penny under £70. Usefully, for thos with smaller clearances at the seat post end, it has a sloping profile.
Slightly different is the Axiom Oceanwave Icepack X15. The main compartment is insulted – great for hot or cold. Other features are more standard. However, it’ll set you back $129.99 (about £99.69 at the time of writing).
To a great extent, value will depend on how much you value the flexible capacity; there are pros and cons to this; the side pockets are of little use, taken up with the drop-down panniers; but you may appreciate the ability to carry that littler extra, especially if the need is unexpected.
Summary
The SKS Infinity Trunkbag XL is a very well-made and pretty well thought out bit of gear, offering flexibility of capacity which only slightly compromises its use purely as a rack pack. The slightly squatter profile compared to other rack packs I have used and the zip closure make it ideal for bicycles with shorter seat-post/tube clearances – more common on older style tourers, such as this old fogey’s. I can see it becoming my go-to for long day rides, but I’d really like to have a light loop.
Verdict 4/5 high quality, adaptable rack pack.
Steve Dyster
https://www.sks-germany.com/en
PUBLISHED FEBRUARY 2026
