Abstract: A modular tray for removably holding a plurality of cell culture t-flasks (t-flasks) at a solution angle is described, discussed and disclosed. Such t-flasks may be held within the modular tray in a manner which forms a solution angle for each held t-flask, such that a bottom surface of the t-flask is minimally raised up off of the inside resting surface of the modular tray, while a bottom edge of the t-flask rests upon the inside resting surface, in order to prevent media within the t-flask from wetting contamination prone regions of the t-flask, such as a neck and a vent cap, which reduces the probability of the held t-flask containing cells and media from becoming contaminated. Additionally, each modular tray may be removably coupled to another modular tray to form an array or a matrix of modular trays.