This article analyzes the application value of the 100ml flat HDPE bottle for feminine wash packaging. Adopting pharmaceutical-grade high-density polyethylene, the bottle features excellent chemical inertness, acid and alkali resistance, and UV barrier properties, stabilizing active ingredients and extending shelf life. Lightweight, shatterproof and sterilizable, it meets pharmaceutical, medical device and daily care standards. The 100ml portable size and ergonomic flat design facilitate single-hand use, leak-proof storage and easy carrying, fitting clinical treatment and daily personal care scenarios. It supports automated production, reduces logistics costs and allows customizable designs. Though slightly higher in oxygen permeability, the bottle’s drawbacks can be offset by formula optimization. With rising women’s health demands, this cost-effective, user-friendly packaging will maintain dominant market competitiveness.

High-temperature-resistant PP has become mainstream oral liquid packaging material for its outstanding heat resistance, chemical stability and safety. It withstands 121°C high-temperature sterilization, simplifying production processes and cutting costs. Matched with anti-theft screw caps, it adapts to automated production and ensures medication safety. With stable chemical properties, medical-grade PP avoids harmful precipitation, preserving the efficacy of acidic and alkaline oral liquids. Lighter and shatterproof than glass bottles, it suits long-distance logistics and daily use, fitting for traditional Chinese medicine, health drinks and pediatric oral preparations. Though inferior to glass in barrier performance, its defects can be improved via material modification and structural optimization. Featuring recyclability and lightweight design, it is a cost-effective, mainstream packaging solution for oral liquid products with broad development prospects.