182cm2 Deep Volume Tissue Culture Treated Flask (Weekend Flask) features extra depth which allows for more media volume; you can leave cell cultures to grow for longer without drying out (maintain your cell cultures over the weekend!). Flask features thick durable walls and stable base which enables filling with flak standing upright. Each flask is printed with lot number and expiration date for easy identification and tracking. Packaged sterile with 5 flasks per re-sealable bag.