The days where plastic straws and their wrappers litter the countertops of restaurants, coffee shops and fast food joints are nearing the end. With several governments, like Australia and the U.K., banning and taxing single-use plastic items and companies like Starbucks, Disney and Hyatt taking their own environmental stand by rejecting plastic straws, sustainable and reusable varieties of the pipettes have been growing in popularity.

Nowadays, it’s no longer about what color straw you’re sporting, but which reusable material you’ll choose. According to the research firm Freedonia Group, Americans reduced their previous consumption of plastic straws by 110 million units in the last year alone. As momentum gains, consumers may now be getting purchase paralysis because of the sheer number of options. Metal, bamboo, silicone, glass — there are many options available when selecting an alternative to single-use plastic straws. The question is, which one is the best?

Related: Starbucks ditches plastic straws for the environment

There are several factors to consider when selecting a more sustainable option for sipping energizing morning smoothies and indulgent midnight milkshakes. Between lifespan and durability, width and length, taste, feel, shape and cleanliness, there are many variables to reusable straws that could make the leap to convert challenging.

Are straws necessary?

Before even delving into these seemingly negligible details some may ask, “Are the liquid chutes superfluous altogether? Do I even need straws at all?”

Considering the widespread pollution that has been caused by disposable straws, eliminating the meal accessories seems like the best overall option. According to a report by 4Ocean, an organization dedicated to repurposing marine plastics to clear the ocean of pollution, a plastic straw can take up to 200 years to decompose. In the meantime, the harmful microplastics eventually disintegrate and contaminate our planet’s air, water and soil, poisoning wildlife and finding their way into our food. As a result, many people are now swearing by a straw-free lifestyle. But there are many reasons, such as dietary restrictions and health issues, that still call for the existence of straws.

Related: UK plans to ban the sales of plastic straws to tackle ocean plastic pollution

Factors to consider when purchasing reusable straws

It’s no surprise that size tops the list of considerations when purchasing reusable straws. Both length and width are important depending on what type of liquid one intends to drink and from which assortment of container. Standard straws measure approximately 7.5-8 inches in length. Those who prefer to drink out of small glasses and coffee mugs are better suited with cocktail-sized straws. The miniature varieties span between 5 and 6 inches, while the longest options settle around 10 inches, although more extensive models can be found for tumbler and thermos users.

A stress of function over form has become the sustainable-straw-purchasing mantra. Smoothies, bubble teas and shakes warrant straws with wider diameters, while less viscous beverages like water, juice and soda that are not semi-solid or thick can be easily consumed through thinner straws. Popular diameters range from around 7mm to 15mm (between 1/4 and 1/2 inches). Shape also comes into play: straight, bent, retractable, flexible — all of these have become important in the straw trade.

Ultimately, most individuals would see these factors as a matter of personal preference. Given that straight straws, short straws and wide-rimmed straws are much easier to clean than their counterparts, they are the most hygienic options for users. It is this quality that makes them the most sustainable choices for new consumers, simply because they have a longer lifespan. Otherwise, unkempt straws get thrown out, and a long-term solution to plastic pollution could turn into another mass consumption (and pollution) trend.

Steel straws

When considering materials, stainless steel has become the most popular go-to material for reusable straw fans. The metal has odor-resisting properties and is the most durable material available for straws. Steel options are also the most widely available on the market because of their heat conducting properties. A cold drink is best enjoyed through a metal straw, because it maintains a crisp and refreshing temperature for the drinker.

Unless consumers are turned off by the metallic flavor that steel can sometimes add to beverages, have sensitive teeth that are disturbed by the hardness of the straw or drink many hot beverages, metal straws serve as the best possible option.

Silicone straws

Those who prefer softer, more flexible straws may turn to silicone. But according to Life Without Plastic, this material, which is generally categorized as a rubber, is actually similar to a hybrid between synthetic rubber and synthetic plastic polymer. The organization cites Beth Terry, author of Plastic Free, who said, “First of all, silicone is no more ‘natural’ than fossil-based plastic. It is a man-made polymer, but instead of a carbon backbone like plastic, it has a backbone of silicon and oxygen … the hydrocarbons in silicone come from fossil sources like petroleum and natural gas.” If this isn’t enough of a deterrent, the same silky texture that makes many people gravitate toward the silicone models is also to blame for its difficulty to wash. Silicone can harbor mold-forming bacteria, and it takes on unpleasant odors after continuous use.

Bamboo straws

With bamboo, consumers may see a reduction in availability. While bamboo straws might not be breakable, they ultimately do not hold up to long-term wear and tear. In addition, bamboo straws are the most difficult to clean of all the materials. Being naturally made from bamboo shoots, there is not a lot of precision in the shape and width to which they are constructed, making it hard to find the right kind of brush to use on them. Sadly enough, because of the chalky texture they leave in the mouth, bamboo straws inevitably fall lower on the enjoyment scale — despite the tropical taste they can generously impart to beverages.

Glass straws

In the end, there is only one other material that can compete with stainless steel in terms of sustainability: glass.

Layered and tempered, glass straws are surprisingly durable and will not break easily if dropped or accidentally mishandled. Glass is a close runner-up to metal’s conductivity, and interestingly enough, it is capable of transferring hot liquids without burning the user. Because the glass is clear, making sure the straw is well-cleaned between uses is as simple as it gets. With no odor and no funny tastes imparted to the drinker, glass straws are a viable alternative to metal straws for the socially-conscious sipper.

In the end, whether plastic straws are replaced with metal, glass or any other alternative, this trendsetting movement is turning a new leaf for the environment on a historical scale.

Via Time, Going Zero Waste, Get Green Now4Ocean and Life Without Plastic

Images via Osha Key, Mark Pazolli, Glass Dharma and Shutterstock