A simple but great idea for feeding rabbits! However a tip to everyone - pellets are not ideal for feeding house rabbits!!! Most pellets even those bought a stores such as pet smart are for feeder rabbits! They often make your own rabbits obese and ill. Hay is a much better and cheaper solution!
Cold weather is on its way. Please ensure your buns are well wrapped up A FUR COAT IS NOT ENOUGH. Cover hutches at night, bed with straw which traps air better than hay. Here is the RWAF's advice for keeping bunnies toasty warm in winter http://www.rabbitwelfare.co.uk/pdfs/RWAFtoptipsforwintercare.pdfp