The item you're referring to is the Philips Avent Anti-colic Feeding Bottle, 330ml (or 11oz).

This is part of the Avent Cassic line (sometimes labeled Classic+ or simply Anti-colic) and has the following key features:

Size: 330 ml (11 fl oz), which is the largest size in this bottle line, generally recommended for older babies (usually 3 months and up).

Anti-Colic System: It features a valve integrated into the nipple (teat) that is designed to flex while your baby feeds, allowing air into the bottle instead of your baby's tummy, which helps reduce colic, gas, and discomfort.

Ease of Use: The bottle is designed with fewer parts for quick assembly and easy cleaning.

Nipple: It comes with a teat suitable for 3 months and older babies, often a Medium Flow or Variable Flow depending on the specific model/packaging.