Baggage Policy - IndiGo

What the official page says

Each Customer is permitted to carry only one Hand Baggage weighing a maximum of 7 kg and not exceeding the following dimensions: length 55 cm + width 35 cm + height 25 cm (total 115 cm, including handles and wheels). In addition to one piece of Hand Baggage, IndiGo will permit a Customer to carry one additional personal article such as a ladies' purse or a small bag containing a laptop not weighing more than 3 kg (inclusive of duty-free items).