The Ergon BE2 Enduro is unusual in that it comes in two sizes, large and small, and within each size there is a large range of adjustment.

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As the name suggests, the BE2 Enduro is designed for enduro racing, which means it has the facility to carry a full-face and body armour between stages. The full- face actually rests on the formed shelf, halfway down the back, and is secured with two straps. There are also two fixed straps on the bottom and a couple of elasticated loops for securing knee/armpads and a jacket. This gear is exposed to any muddy spray, but the pack is pretty versatile and you can latch on a lot of clobber.

One of the cool features of the BE2 Enduro is that it comes in two adjustable sizes. You can modify the position of the pack on the shoulder straps by loosening a Velcro strap inside and sliding the whole thing up or down. And that thin section also allows the pack to hinge slightly in the middle, mirroring the shape of your spine when you’re leaning forward.

Obviously creating this hinge does split the storage, which means tools and spares go in at the top and there’s a pocket at the bottom for the 1.5L reservoir. This is a Hydrapak design and it has a lockable bite valve, but no magnetic fastener, although it works fine without one. Space for tools is at a premium because also stuffed inside this pack is a foam spine protector. This is removable and also upgradeable – we actually swapped it for the BP100 (£31.99) a thinner, more flexible, but certified protector.

With its wide Velcro waist belt and padded shoulder straps, the Ergon BE2 Enduro is pretty stable, even with all the gear installed. It’s well made and you can lash on a load of gear, but the internal storage and reservoir capacity is a compromise. If you’re doing a full-day enduro, 1.5 litres of fluid just isn’t going to be enough, and splitting the space limits the length of the items you can carry.