These bottles clip onto the cage with a retractable spring cable and are non-spill. The bottles are made from recycled glass with measurements labelled on the sides. Size: 175ml Product Code: GLA175 Barcode: 5415341002104 Size: 350ml Product Code: GLA350 Barcode: 5415341002159 Size: 750ml Product Code: GLA750 Barcode: 5415341002166