It is not necessarily bad to leave clothes in a storage unit if you prepare them properly, but it can be bad if done incorrectly because clothes can be damaged by moisture, mold, pests, and temperature extremes. To store clothes safely in storage unit, you should wash and completely dry all clothes before storing to prevent mold and odor, similar to maintaining clean environment with HEPA filtration to prevent contamination. Use climate-controlled storage unit to avoid humidity and heat damage, as non-climate units can have temperature swings that cause yellowing and mildew. Pack clothes in airtight plastic bins with lids rather than cardboard boxes which attract pests and absorb moisture, and use cedar blocks or silica gel packets to control moisture and pests, avoid mothballs which leave odor. Do not use vacuum bags for long term as they can damage fibers. Fold neatly or hang in garment bags for delicate items. Label bins. Check unit periodically for leaks. If stored properly in climate-controlled unit with clean dry clothes in sealed bins, clothes can be stored safely for months to years without damage, but if stored dirty, damp, or in non-climate unit with cardboard, it is bad and can lead to mold, mildew, insect damage, and permanent odor, so preparation and climate control are key to safe storage.
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