I use the energy drink from Science in Sport a lot but the scoop it comes with is too big, its great for measuring the right amount out but you can't get it into the bottle without it going everywhere. This funnel fits on the top of the bottle and gives you a wider aperture to aim for.http://www.scienceinsport.com/sis-products/sis-go-range/sis-go-drinks-and-powders/http://www.scienceinsport.com/sis-products/sis-all-products/800ml-sis-pro-yellow-cycling-bottle/