To give a good idea of the equipment I use for photography, I have made an overview below.

Camera’s

Canon EOS 5D Mark III
Canon EOS 5D Mark III
Dream of a camera, absolutely recommended for everyone; because of its super-fast auto-focus but perhaps even more importantly the focus points (61) (and cross focus points (41) AND dual cross focus points (5)). My go to camera in 95% of all cases.

Flashes

Canon Canon Speedlite 600EX-RT
Canon Canon Speedlite 600EX-RT 
These flashes can of course also be used in a studio setup (slave, fill-flash etc.). For optimal use I always provide my strobes with a Sto-fen Omnibounce for even better light, etc.

Lenses

Canon EF 17-40mm f/4L USM
Canon EF 17-40mm f/4L USM
The advantage of this 17-40 wide-angle lens is that you can capture an enormous object without distortion, which is ideal for groupshots, for example. This is a lens that I always have when I am at a festival or indoor event.

Canon EF 24-105mm f/4L IS USM
Canon EF 24-105mm f/4L IS USM
More or less my default lens. Why? Because this lens is in fact ideal for festivals when you ‘stand in the crowd’. You often have enough ‘reach’ to capture something fast / sneaky or the ‘width’ to be able to capture multiple objects at once.

Accessoires – General

Op/Tech Grip Strap
Op/Tech Grip Strap 
I personally hate the neck / shoulder straps and wear my camera 98% of all cases in my hand and therefore such a strap is ideal so you can also let the camera rest to let your fingers relax.

Accessoires – Bags

Lowepro Stealth Reporter D400 AW
Lowepro Stealth Reporter D400 AW
My ‘normal’ job bag where I can usually take 1 DSLR and 3 lenses. Usually fits in the ‘slightly larger’ lockers that are available at most festivals and is therefore the logical replacement in cases where the safety of ‘big’ job bag can not be guaranteed.

Misc

All lenses are equipped with filters for damage / dust etc.
Different Canon Lens Hoods matching the lenses.
Different CF and SD memory cards.
Different Eyepiece Extenders due to glasses.
Extra batteries and accumulators.
Additional lens caps.
Extra carrying straps.
Cleaning gear.