This bag from K&F Concept is the kf13.131 model.

The bag itself is very good quality. The stitching and materials used are excellent throughout. Normally the bag has a capacity of 25l, but the top compartment can be extended upwards by an extra 1.5L, making it possible to store 26.5l in total. This expansion method is built-in, easy to use and very effective.

The bag has an inbuilt frame, which whilst not totally rigid, does make it keep its shape at all times. This design does make it less convenient to store when not in use, but has the advantage of making it easier to pack, as well as offering better protection. Despite this more rigid design, the bag remains relatively light weight.

The large lower compartment can be accessed by the main flap, or two (almost) full length side flaps. Inside the compartment are there separate moveable dividers, which are attached via Velcro, and can be arranged in a variety of different ways to suit your needs. A great feature of the bag is that the divider between the top compartment and main compartment can actually be pushed upwards. Whilst this makes the top compartment smaller, it allows you to accommodate a longer lens if necessary.

Both of the side flaps have a zipped cover on the inside, which when opened, reveals a variety of pouches, to securely store various memory cards, batteries, leads, etc. On the outside of the side flaps are expandable pockets for water bottles, umbrellas, etc. Only one of the flaps has straps to secure longer/heavier objects, such as a tripod.

The top compartment has two open mesh pouches at the rear, and a larger zipped mesh pocket under the lid. As described before, this compartment can be extended upwards so that it can accommodate larger equipment, or more items.

On the rear of the bag is a full length padded compartment which can not only take a 15.6" laptop, but also has a pocket for a tablet device such as an iPad. This compartment can be opened fully, making it much easier to put in and take out your devices.

The zips are all waterproof and work well. I've experienced no issues with them sticking or getting caught. The zips on both the main and top compartments have a small strap with a 'popper' attachment. These tabs allow you to secure the zipper pulls behind them, so that a thief can't surreptitiously unzip the bag without you realising. A waterproof cover is provided which can be stored in a pocket underneath the bag.

As well as the main straps for carrying the bag as a backpack, there is also a padded strap that allows you to carry it vertically, one handed, and a luggage strap on the back, which allows you to slip it over a luggage handle. There is also a strap on the side, that allows you to carry it horizontally one handed, but this is more designed for manoeuvring the bag, rather than using it to carry any distance.

In use the bag was comfortable to wear and I didn't have any issues with sweating. It was easy to handle, to take equipment in and out of, and to change the layout as and when I needed to. The various pouches proved genuinely useful, and despite it holding a lot of equipment, the bag itself always felt surprisingly compact.

The only real niggles I have is that I wish the zips on the side pouches had the same security tabs that those on the main and top compartments do. I also wish there were straps on the bottom for attaching longer tripods.

In conclusion, I've been very impressed by this bag. The only thing I don't know is how well it will stand up to long term or heavy usage, but so far, so good. Compared to the competition the price seems reasonable too, given its quality and features. As a result, despite the couple minor niggles I mentioned, I have no hesitation in giving this bag a full 5 stars.

~ Ethics Statement: Amazon provided me with this product and asked that I give my honest and impartial opinion about it. That’s what I’ve set out to do in this review, so I hope you found it helpful. ~