The BiTran bag can be used for transportation of wet tissue and for short to long-term storage. Manufactured from a special barrier film, making the BiTran bag impermeable to formalin vapours. Therefore, no hazardous vapours can pollute the laboratory once the bag is sealed. Additionally, the double-zip lock seal provides a leak-proof closure and can be easily opened or closed as many times as required. Key Benefits: Leak-proof, well proven long-term storage, space saving, high visibility barrier film, a range of sizes available.