Listings highlight airtight, leak‑proof seals with secure latches (including two‑latch designs) and vented lids or vents under latches for microwave use. Lids are shown in both plastic and glass materials; look for explicit “airtight” or “leak‑proof” labeling when choosing a container.
Some plastic containers are described as stain‑ and odor‑resistant, while tempered glass is noted to resist stains and not absorb food odors or flavors. For long‑term odor resistance, listings generally favor glass or plastics labeled as odor‑resistant.