If not possible, use crumpled tissue as a buffer between these items and the garment. Place tissue over the garment and add the lid. Do not seal. In fact, slits to allow air circulation could be added. Avoid wrapping in plastic unless water damage is possible.
Plastic bags are unstable.
Plastic bags can give off damaging fumes, trap moisture, and provide an environment for mildew to grow. Horizontal versus Vertical Storage Box, or horizontal storage has been discussed above. This is desirable for heavy garments with beading or wedding gowns with heavy trains or sheer bodices. Knitted garments should be stored flat to avoid stretching over time. Also, small garments such as christening gowns are easily stored flat.