We dont Have Lockers; Im not sure if any Schools in the UK do.
I have 6 Lessons a day; But i dont always have to take that many Books.
Some teachers allow us to leave our books behind after class, providing we dont have homework to be completed in the book.
The bag i take to school varies each day; depending on how im feeling or whatever: I have some over-the-shoulder bags, like Satchels. Then i have a few oversized handbags, which is what i use most of the time.
In my bag, I usually have around 4 books on average, plus a magazine, Pencil Case [6 pens; 3 pencils; coloured pencils; ruler; eraser; sharpener], Make-up bag [with lipgloss; vaseline; mascara; eyeliner, a hairbrush; hair grips; hair ties; wet wipes; and a mirror], Cell/Mobile phone, Chewing Gum, a peice of fruit, and a bottled drink.
[YES, I REALLY DO CARRY THAT MUCH STUFF AROUND WITH ME ALL DAY, I MUST HAVE ARMS LIKE STEEL! LOL]
If its Hot, like, Summer months, i dont take a jacket, or a coat. i usually have long sleeve'd shirts on anyway [we have to wear a uniform].
If its cold; i take a coat, i have it on when im outside, and it sits on the back of my chair when i dont.
If the weather looks kinda dubious, i take a light jacket.