Hi TillyTrotter
Our decorations are stored in a mixture of cardboard/plastic boxes, or storage bags. Every box/bag is labelled with the contents, so I know what is inside without having to open it first.
The tree decs are mostly in plastic boxes, organised by tree and colour, eg " room tree/silver", or "porch tree/gold". Don't try to squeeze in too many, you'll risk breaking them.
The larger, special baubles are wrapped in tissue and stored in gift boxes, the kind you buy for presents. Make sure the box is deep enough to take the bauble without squashing. Also, you can store special baubles in the cardboard tube gift boxes, the sort for giving a bottle of wine/spirits, as they are quite sturdy.
The door wreaths are in individual wreath bags, and hung on pegs. The garlands from the mantlepieces are in long fabric red storage bags, or shallow plastic boxes ( the sort that go under the bed).
I have made/adapted cardboard boxes for other individual items, such as the 2 traditional style Father Christmases for the tops of the trees, the pottery nativity figures, various ornaments etc. I either use an empty delivery box ( lots arriving at this time of year), or cut down a bigger box. I then cover them with Christmas paper, and label. Try to keep the things for each room together, it makes decorating next year much easier!
All the soft decor ( cushions, throws,tree skirts, tablecloths, towels etc), are stored in those large foldable bags with handles, usually sold as laundry or shopping bags. Don't forget to label with the contents, and again try to group by room.
Everything is then put up in the loft ( MrLP made me simple wooden shelving units up there) until next year.
I find that making sure everything has its own labelled box or bag is the key to both storage, and less stress next year.
Hope this helps, take care xx