The word "perishable" describes something that goes bad somewhat quickly, like vegetables, fruit, meat, and other fresh food. So "non-perishable items" are things that don't go bad quickly. Examples of non-perishable items are:

• canned goods
• cereal
• dried beans
• crackers
• nuts
• food in jars

Like "canned goods", you usually talk about "perishable items" in the context of:

• donating canned goods to someone
• stocking up on canned goods in case of an emergency