Dh has been using a bag like this for work: m.sportsdirect.com/mt/www.sportsdirect.com/puma-fund-sports-bag-707016?colcode=70701622&un_jtt_v_un_PDP=yes&un_jtt_v_un_info=&un_jtt_v_un_pers=&un_jtt_redirect
It's the perfect size and shape but looks awful: he wears a smart suit, shiny shoes etc then carts this thing around with him.
He takes a load of files, aforementioned shiny shoes, large rectangular lunch box and often his gym kit into work so his bag needs to be big enough for that, be able to store his paperwork upright, fairly comfortable to carry (he walks 3 miles to work) and strong enough that the straps don't fray after a week (happened every time so far 
Please tell me such an item exists and please tell me where I can buy one... Don't want to spend an absolute fortune but open to all suggestions. TIA 