depends on how long the long ride is, if we are stopping at a cafe, how hot/cold/dry/wet the weather, how much luggage we have with us & what the route is.
Jam sandwiches (unless I have made a batch of cashew nut cheese) and coffee if out over lunch (I can't eat out being allergic to all dairy products which even turn up in bread & margarine these days). Some dairy free flapjacks or other such bars (homemade or otherwise). Dried fruit & nuts and anything we fancy in the way of drinks but usually includes coffee & isotonic drinks (medical condition dictates the isotonic drinks).