Lucozade where possible. If not convenient to carry lucozade I always have glucose tablets or jelly babies stuffed in every pocket.
If I'm lower than target but not hypo I'll have a treat to bring myself back up like a small piece of toast with some scrummy homemade jam or another treat. I've never had a sweet tooth but the fact that I'm low-carbing somehow makes things I never even wanted before a treat!
I use the lucozade carbohydrate energy gel satchets, they are small and easy to carry in pocket and dont go stale or break up like tablets do, and can be bought in sports stores or cycling shops, bit slimy but anything tastes good when having hypo.
I use haribo supermix. 7 sweets wrapped neatly in a clingfilm balls - 20grams carb. I find this perfect especially for energy boosters when running. I wonder if I get stopped by police before a half marathon will they believe that the packets are not drugs!