What is the best way to store comic books long-term?
Materials Matter
Use archival-quality supplies: bags made of polyethylene (PE), polypropylene (PP), or Mylar (polyester). Avoid PVC bags, which can off-gas and damage comics over time. Backing boards should be acid-free and buffered; replace them every 5–7 years if they become yellow or warped.
For valuable comics (over $100), consider Mylar bags with full-back acid-free boards. For bulk runs, PE or PP bags with standard boards are fine and more affordable.
- Polyethylene (PE) bags: cheap, good for short-term (2–5 years).
- Polypropylene (PP) bags: better clarity and longevity (5–10 years).
- Mylar (polyester) bags: best for long-term (decades), but pricier.
- Acid-free backing boards: essential to prevent bending and off-gassing.
Environment & Handling
Keep comics in a cool, dark, dry space. Ideal conditions: 65–70°F (18–21°C) and 45–55% relative humidity. Avoid attics, basements, garages, and direct sunlight. Fluctuations in temperature and humidity cause more damage than steady but slightly imperfect conditions.
Store boxes off the floor on shelves to protect from floods and pests. Handle comics with clean, dry hands or nitrile gloves. Support the spine when opening and never force a comic flat.
Boxes & Orientation
Use acid-free cardboard boxes designed for comics, like those from BCW, DrawerBox, or Gerber. Store them upright (like books on a shelf) or flat, not leaning at an angle. If stacking, don't overload; excessive weight can warp bottom comics.
For high-value comics, consider professional grading and encapsulation by CGC or CBCS, which provides a hard plastic case and a grade label. But note: encapsulated comics still need proper environmental storage.
- Short boxes: hold about 150–175 bagged comics; easier to move.
- Long boxes: hold about 300–350; heavier and can bow if overloaded.
- Drawer boxes: allow access without unpacking; more expensive.
- Avoid cardboard not labeled acid-free; it can yellow comics.
Common mistakes
- Using PVC bags or cheap cardboard boxes that release harmful gases and acids.
- Storing comics in humid basements or hot attics, which accelerates foxing, mold, and brittleness.
- Packing comics too tightly, which can bend spines and cause spine roll.
