• Leak-proof to keep food fresh and prevent spills • Easy to sanitize and dishwasher safe • Containers and lids are freezer safe • Containers are oven safe up to 300 degrees (not for use in microwave) • Square shapes stack to save storage space • Lighter and sturdier than glass • Etched tare weights for easy bulk shopping • Plastic-free, durable, flexible, platinum-grade silicone • 304 (18/8) stainless steel • Free of BPA, BPS, phthalates and lead Sizing • 50oz, container size with lid on: 6.5” x 3” x 6.5” (entree size). Lid fits all U-Konserve 50oz square containers. • 30oz, container size with lid on: 5.75” x 2.5” x 5.75” (sandwich size). Lid fits all U-Konserve 30oz square containers. • 15oz, container size with lid on: 5” x 2” x 5” (snack size). Lid fits all U-Konserve 15oz square containers.