Northern Card Care - HydroShell

HydroShell — Anti-Curl Humidification Case

Keep your cards flat, flexible, and damage-free through every stage of the humidification process.

HydroShell is a magnetically secured, stackable card shell purpose-built for use inside a humidor. Its open-slat design lets moisture reach the card evenly from both sides, while the rigid frame holds the card flat and prevents the curling, warping, and edge lifting that raw cards are prone to when exposed to humidity unsupported.

Key features:

Anti-curl support — the frame keeps cards rigid and flat throughout humidification, protecting against warping

Magnetic closure — snaps securely shut, keeping the card centered and secure without added pressure

Stackable Design — load multiple shells into your humidor at once for batch treatment

Open-slat airflow — slotted front and back panels maximize moisture exposure without direct contact stress on the card surface

Reusable — durable construction built for repeated use across your restoration projects