Do you have a child who is fashion conscious, or who loses everything? 
DS1 is going into year 8, and a sensible school with relatively little peer pressure. He loses everything.
School shoes - same as primary.
School trainers - cheap Nike.
Bag - he's currently using a black rucksack from SportsDirect. Understand the girls may be bothered, but he assures me that the boys don't care. He has a separate Games Kit bag, a swimming kit bag, and a boot bag (for muddy stuff).
Coat - cheapest black parker style I could buy, as he lost the last one.
Stationery - we got all excited last year, with folders, and nice pencil cases for home and school. I fondly remembered my maths kit which lasted me from age 11 until 16. He lost/broke/soaked in ink the lot. Twice. We popped to WH Smiths today and topped up with their basic range and a £1.50 clear pencil case.
Again, it depends on how tidy and fashion aware your child is. Apparently the rubbers in the style of burgers are popular, although the art teacher is not keen.
I label EVERYTHING. It doesn't seem to make the slightest difference!