If you feel like splashing out, go for an M&S bag.
Lmao, stop terrorising the guy! You could wear one of those in fashion bags like the back packs if you know what I am on about? I'll find a picture as an example if you need me to and I seen girls with huge coats wearing them so I guess its alright. Look in peacocks at back packs to see what I am on about and you can get them anywhere from primark to asda! They are quite popular!
I got a Superdry backpack in January, it went through hell and back carrying all my GCSE revision supplies and still looks in excellent condition. I'll still use it for sixth form until it breaks. It was £35 but considering the masses of money I've spent on handbags and they broke in like 3 months it was worth every penny.