Features: tissue culture flasks are available in tissue culture treated and non-treated suspension culture versions tissue culture treated flasks have uniform hydrophilic surface ideal for consistent cell attachment convenient zip-closure bag is a practical alternative to folding and taping open bags large opening, canted neck design and moderate angles allow easy access to entire flask surface; ideal for cell scrapers stable base enables filling with flask standing upright thick, durable walls flask is printed with lot number and expiration date for easy identification and tracking molded, interlocking t design for improved stacking on 75, 182, & 300cm and 250, 600 & 850ml size flasks vent caps feature 0.22m hydrophobic membrane 182cm flask offers more growth area than standard 175cm flasks 182cm deep volume flask has extra depth, allowing more media volume; you can leave cell cultures to grow for longer without drying out or depleting all nutrients maintain your cell cultures over the weekend