How to choose the right size: start with the camera you carry most
A sling is sized by the largest item that has to live in it, which is usually your camera with its lens attached. Batteries, cards, a phone and keys fill the gaps around it. So start with the one camera and lens you will carry on most days, not every piece of gear you own.
Then compare that setup with the bags. The 3L measures about 30 × 19 × 11 cm and the 6L about 35 × 23 × 12 cm. These are outside measurements: padding and dividers take up some of that space. Leave a margin rather than planning to the last centimetre. If your camera and lens are close to the 3L’s limits, the 6L is the safer choice.
Who the 3L suits
The 3L is built for the one-camera, one-lens day. VideoLinks lists it for mirrorless or compact gear: a compact camera, or a small mirrorless body with a prime or short zoom attached. A spare battery and cards go in the front organiser pocket, with room left for your phone and wallet.
Its strength is what it leaves out. A smaller bag sits closer to your body, swings round to the front more easily when you want the camera, and stops you packing “just in case” gear. For street photography, sightseeing and long walking days, that restraint is often the point.
The limit is just as clear. A second lens, a flash or a bulky zoom will quickly crowd it. If those regularly come with you, the 3L will start to feel tight.
Who the 6L suits
The 6L is listed for a mirrorless or compact DSLR setup. It is about 5 cm wider and 4 cm taller than the 3L. In practice, that extra room is what lets a second lens or a compact flash have its own compartment beside the camera, kept apart by the FlexFold dividers.
It is also the better everyday bag if you carry non-camera items. A power bank, sunglasses or a small notebook compete with your camera for space in the 3L; in the 6L they can sit alongside it. The trade-off is a slightly larger bag against your body, which most mirrorless shooters with more than one lens will find a fair exchange.
What stays the same across both sizes
Both sizes use the same 400D nylon canvas with a DWR-coated shell and weatherproof zips. Both open from the top with a clamshell-style zip, have a front zip pocket with an organiser, and use a strap that adjusts for left- or right-shoulder wear. You are choosing capacity, not a different feature set, so the decision is simply what you need to carry.
Images in this guide are illustrations generated from the products’ catalogue photographs. They are not photographs from a packing test.