I got a tool bag from a cycle shop (cost £5 and fits perfectly under the seat, very similar to a shower bag but smaller) and carry tools for running repairs, anything else, i got RAC membership

I also carry a foil blanket, face mask for mouth to mouth, bulb and fuse kit, cargo net, disc lock, ear plugs, puck and phone charger for a cig lighter i installed. Next on my list is spare levers and a puncture repair kit
I'm going to get a seat cowl so i can max the space under my seat to get a waterproof over suit in too, so as not to get caught in a summer shower
