Liquid personal-care products are sold almost exclusively in single-use plastic bottles

The problem

Liquid personal-care products — shampoo, conditioner, body wash, liquid hand soap — are sold almost universally in single-use plastic bottles (typically HDPE or PET). Most are used once and discarded; global plastic-packaging recycling rates are low (the Ellen MacArthur Foundation estimates roughly 14% of plastic packaging is collected for recycling, and less is actually recycled).

Why the format persists

Plastic bottles are not used because they are ideal — they persist because no alternative beats them across every axis at once:

• Cost & weight: HDPE/PET is extremely cheap and light, keeping shipping cost and transport emissions low.
• Functional fit: the products are wet, slippery and used in showers. Plastic is unbreakable, squeezable, water-resistant and chemically compatible with surfactants.
• Manufacturing flexibility: plastic molds cheaply into any shape, with integrated pumps and caps.
• Infrastructure inertia: filling lines, bottling equipment and retail logistics are all built around the format.

Constraints any solution must respect

A replacement is not viable unless it is competitive on cost, hygiene/safety, and consumer convenience simultaneously. Solutions that win on waste reduction but lose badly on any of these three have repeatedly failed to move past niche adoption.

This issue is the parent for the specific sub-problems that make the format hard to displace, and for proposed approaches that address them.