I use vetbed for my outdoor hutches. Its fabulous, much less hassle and money than shavings and hay! I was going through around £20 a month on hay and shavings but since switching to vetbed i only go through £8 on hay.
The vetbed can be pricey to set up, how big is your hutch? For my 4ft by 2ft double i bought one full hutch set, and half a hutch set for change over costing me £30.
It will need fresh newspaper underneath daily, and need washing either in the washing machine or by hand once a week (if you have two pigs) however the smaller the hutch and the more pigs you have it will need changing more frequently