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, Signs 105mm 2.8 macro and Tokina 11-20 2.8.
Most used out of them is the wide angled 11-20. This is a really good lens for landscapes.
Bags include the Manfrotto Pro Light 220 - really comfy bag when fully loaded. A Lowe Pro Sport Shoulder 18l for when taking a small kit out.
Tripod - A Manfrotto 055cxpr03 and the Induro BHD2 ball head. This is a good light weight combination. I also picked up 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 Big 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.