Instead of packing like decorations, pack by area or room.
For example, instead of packing all the garland from the entire house in one box,
if you use garland in the living room, make a 'living room' box
with all of the decorations for that room.
I have a small guest bath, so I decorate it by theme--fall, Santas, Snowmen,etc.
I pack all of one theme into a box for next year.
Bankers Boxes are great for this, just be sure to label the outside
for holiday decorating next year.