[Clog Bolt] I own the Hadley Pro and was unable to arrange the interior to fit 2 or 3 Fujifilm X-T1 cameras with larger zooms attached (plus the usual extras).  The Pro simply was not wide enough.  This problem was overcome with the design of the Billingham S4 bag.  Although both bags have roughly the same exterior dimensions, the S4 is easily configured for my needs.  As expected, both bags feature the quality and attention to detail this manufacturer is known for.  Now all I have to do is live long enough to wear out them out.

[Shoulder Strap] Carries my digital SLR with a couple of lenses and is very well protected. It is easy to get the equipment in and out of the bag.

[Clog Bolt] As with all the other Billingham bags the S3 bag is a beauty. It is the ideal size to carry my X-T1, X-T10 and a spare lens. Also it looks great with the Avea pouches attached. Highly recommend the bag.

[2] I like to go light (weight and size). I have a small Billingham 72 for my Fuji X-E3 and absolutely love it. However, it will not hold an extra lens, so I moved up a notch to this S2 and it fits my needs perfectly. The styling, craftsmanship, and quality all go without saying. For me the downsides are two: The front pocket will not hold much and does not have a separate closure (just a top center snap). Second, I prefer the fully open style top of the smaller 72, whereas this S2 has a zipper closure under the cover making for an extra step and the camera does not slide in and out as easily as with the fully open top of the 72. However, these are minor personal preferences, and I would still buy this bag again.

[Shoulder Strap] I really wanted this bag to work, but it was just to small. Coming from a Kata/Manfrotto bag which has multiple pockets and compartments and could hold my equipment... the Billingham bag was just not big enough. It was an awesome bag, quality materials, and looked very sharp... just wasnt big wnough and needed to be returned.

[Clog Bolt] This bag is great for travel and a mirrorless system. If traveling light is your goal, you will be pleased. I put an iPad Pro 9.7, Sony a7II 24-70mm f/4 attached with room for 24-240mm and 50mm lens or a 70-200mm, with room for batteries. The quality of the bag itself is bar none. The leather trim is a nice touch and the canvas feels really durable but soft. The other great thing is that it doesn't look like a camera bag which is exactly what you want when traveling. Definitely worth the purchase.

[2] I have three Billingham bags; a Leica Combination (my favorite for a Leica and three lenses) a Hadley Pro (my Nikon SLR and four lenses) and then this S4. I use this S4 when I am photographing events and want to have multiple bodies so I dont have to change lenses as much. I like that it is wider than the Hadley Pro, as I often like to use external finders on my Leicas, and for that, the Hadley is a little too narrow. When I use this bag I often have an M6 with a 28mm lens, an M4 with a 50mm lens, and then an FM2 with a 180mm and a 105mm. This allows me to work quickly and respond to changing environments. the front pouch is large enough for filters, a light meter, and some film, but I feel that it is just a hair too narrow. I really like the larger pockets of the Pro and the Leica bag better in that regard. A shoulder strap is really a must for this bag if you have it loaded out and are carrying it for more a while. I also like how this bag has a zipper that you can use to keep dust or prying hands from reaching in. It also has a design that lets you tuck the zipper out of the way when you need to move more quickly. The zipper and this tuck feature are nice and also the two main downsides of this bag. Because of the zipper, this bag is a bit less waterproof then say the Pro or the Leica bag which have a top flap completely covering the opening and in S.E. Asia downpours have kept my gear completely dry.  I fear that if I was using this bag in that kind of environment that the zippers are the area where water can enter the bag from the side. The other downside is that when you have the zippers tucked away, there is an opening on the sides that can let in a lot of dust. I love this bag and have enjoyed using it over the past 1.5 years when I have a specific event that I am photographing. For a daily bag and a travel bag when I am carrying it all day, I take the Leica bag, and the Pro is for when I am using my SLR and need to take my 180mm or 300mm lens.

[Clog Bolt] I adore this bag for my Micro 4/3. I have a lot of camera bags, and this is always the first one I reach for. It can hold two Olympus OMD bodies, one with a 12-40mm f/2.8 attached and the other with a Panasonic 35-100 f/2.8 attached. And I still have plenty of room for accessories. If I am using smaller lenses, I can also fit several spare primes. My rule is that if my gear fits into the Hadley Small, then I am good to walk around all day in any kind of weather. My shoulder will still feel good at the end of the day, and I don't have to take breaks because I am tired of carrying gear around. If my gear doesn't fit into the Hadley Small, I am carrying too much. I also have a Hadley Pro, which is a great bag and which I use when I need to carry a lot of gear: two bodies and a big lens (like the Panasonic 100-300), big flashes or my 13 MacBook Air. With a fully loaded Hadley Pro, though, I will feel the weight by the end of the day. It's okay for a few hours, but not all day. There is nothing else that matches the comfort and flexibility of the Hadley Small --- and I have a lot of camera bags. And the Hadley Small is a good looking bag, too. I like the Hadley Small so much that I have two of them, one in Sage/Tan and one in Black/Tan. I have had the Sage bag for several years, and it still looks brand new --- and I don't baby it at all. I haven't had the black bag as long, and I am a little concerned that it might show lint more than the sage bag. It's really too soon to tell. The Hadley Small is an expensive bag, but it is worth every penny. Just get it.

[2] I love this bag. It carries my Olympus Pen f camera, three lenses, and the flash and an extra battery. Not only is it so convenient, it is also remarkably stylish.