The #305 is the best heavy duty case to keep your gear safe from water, impacts, and the elements with our meticulously engineered waterproof, crushproof, and weatherproof hard cases, perfect for travel, photography, outdoor adventures, and industrial use. Foam Option - This #305 hard case includes convoluted egg foam in the lid. (1) base layer of 1? thick foam. (1) layer of 1" thick pluckable cubed foam. (2) layers of 1.5" thick pluckable cubed foam that allows you to customize the fit to your items. Proposition 65 Warning: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov .