Domke 1" Web Camera Strap with Swivel Quick Release (Black)

Around 20"

Best strap Ive ever used. I use them professionally every day, and I see a lot of others doing the same. If youre going to beat the hell out of your gear on a daily basis, its better to spend the extra money. Think Tank and Domke are usually a good bet. I carry a 1DX with a 70-200 2.8 on it and it's fine. If you go with a 300 2.8 or larger, you'll want to use the strap thats attached to the lens, plus the one on the camera. In most cases, its not the strap you have to worry about with heavy lenses, but its the lens mount on the body, thats where things can break. I havent seen the 5300, but i know Nikons used to have those little round attachment points. If you still have the triangular metal things this strap will work perfectly. If not, you can use some small keyrings to attach it to the body.