Stasher Reusable Silicone Bag

Stasher bags are made from 100% platinum food-grade silicone throughout the entire bag including the closure seal — there are no plastic components in contact with food. Platinum-cured silicone is produced using a platinum catalyst that results in a highly pure, fully crosslinked silicone polymer with minimal residual compounds. It is the specification used in medical implants, laboratory equipment, and premium food-grade applications. The food safety profile is among the best available for any flexible storage material.

The closure mechanism in Stasher bags is a silicone-to-silicone pinch seal — essentially two silicone edges that press together and form an airtight connection. This design avoids the plastic zipper strips used in less expensive silicone bags, which are typically polypropylene or polyethylene. The all-silicone construction means every food contact surface is platinum silicone.

Stasher bags are rated for a wide temperature range: safe in the freezer, dishwasher, microwave, boiling water, and sous vide applications up to approximately 400°F (200°C). The thermal stability of platinum silicone at these temperatures is well-characterized — it does not melt, deform, or release compounds at temperatures well beyond normal food preparation ranges. This makes Stasher bags one of the more versatile single-material food storage options available.

The higher cost relative to conventional silicone bags and single-use plastic bags is the main barrier. On a cost-per-use basis over several years of daily use, the math favors reusables significantly — but the upfront investment is real. Stasher offers multiple sizes from snack pouches to half-gallon stand-up bags. For households that have converted most food storage to glass and stainless, Stasher bags fill the specific niche of flexible, leakproof, portable storage where rigid containers are impractical.