Here are a few snack ideas for under 100 kcals. Please note that the kcals shown for the snacks listed were correct when compiling and do change from time to time as do the nutritional values, but this will give you a great reference point when your feeling peckish! Please ensure that you check the ingredients list for allergens before consuming:
Hula Hoops Puft - ready salted (pack of 6) - each 15g bag is 72 kcals
Cadbury Curly Wurly (pack of 6) - each bar is 97 kcals
Mcvities Penguin Mini Biscuits (6 pack) - each bag is 90 kcals