The bag is height 30cm x width 20cm x depth 12cm. It is perfectly sized to hold either three (3) 180ml NaturalFlow bottles plus two (2) Lola&Lykke 150ml milk storage bags, or alternatively, the Lola&Lykke Smart Breast Pump, two (2) NaturalFlow baby bottles plus two (2) Lola&Lykke 150ml milk storage bags.