I have a fairly large bag which I just keep everything in. It's pretty much a wardrobe with carry handles now! I just tend to wear, wash, shove it back in the bag again.
I have an old washbag with lots of sections which I use for bits and bobs: whistles, coins, books, spare laces, spare contact lenses, some ibuprofen etc etc. This is handy for the simple fixtures as that is what I take pitchside with me. When the weather is a bit more unpredictable I'll go large!
I also have a couple of carrier bags inside which I can use to divide stuff up to make it a bit more manageable.