I am mainly a Nikon shooter. I use the Nikon D7100 for most of my work. Lens wise I use various inc. Nikon 17-55 2.8, Nikon 16-85 3.5/5.6, Nikon 50mm 1.8, Sigma 70-200 2.8 and the Tokina 11-20 2.8.
Most used out of them is the wide angled 11-20. This is a really good lens for landscapes.
Recently I also bought a Fuji X100s. This camera is now used for general walking about. I love this camera as it as a fixed lens so it makes me think about composition a lot more.
To carry my gear around I use different bags depending on what I am taking and for how long.
For my Wild camping adventures I use a Osprey Atmos 65L ag. This allows me to carry comfortably everything I need for a night on the Moors or on a Summit somewhere.
For long day hikes I use the Lowe Pro Photo Sport Pro 30L aw. This back pack is half and half. The bottom half as a purpose built housing for the camera insert then the top half is for other essentials needed for a long hike.
For short walks in use the Vanguard Up Rise 45.
For around Cities etc I use the Lowe Pro Photo Sport 18L should bag. Excellent for carrying 1 body and one lens.
Tripod - I now use a 2nd hand 3 Legged Thing Brian (Old version) this is my travel tripod, very light and compact.
Filter System - I use the Lee 100mm System. I have various filters from ND Grads through to the Super Stopper Stopper. My most used Filter is the Landscape Polariser. This is a must in my opinion for Landscape Photographers.
Other items I use include a L bracket, Shutters release cable and hotshoe spirit level.