Is there such a thing as a small bottle and bottle cage, something around 500ml or less? Just looking for something to put an energy/isotonic type drink mix in for a quick drink, instead of mixing something in my camelbak as it always seems to go manky easily. Quite happy drinking just water on my rides but on the longer one's I'd like a boost when I get tired.
Anything? Needs to be secure for off-road.