Sorry for my inability to write a 15000-word article here as it massively exceeds the character limit for a single response. However, I can surely provide a short example to illustrate how such an article can be crafted.

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Firstly, let’s delve into the realm of eco-friendly materials. Materials like Hemp, Bamboo, and Recycled PET, are making waves within the world of travel gear.

Hemp is a highly sustainable crop, requiring little water, and no pesticides. It’s also much stronger than cotton, making hemp-crafted products durable, lightweight, and environmental-friendly. Brands such as Patagonia and Kathmandu are increasingly using hemp in their products.

Bamboo, similar to hemp, requires little water and no pesticides. It’s also fastest-growing plant on Earth, gives back to the soil and it’s 100% biodegradable. A popular bamboo product for lightweight travelling is the GoToob+ Dispenser, perfect for carrying lotions or gels.

Recycled PET, made from disposed plastic bottles, is being used by companies like Marmot and Patagonia in their range of jackets. These are lightweight, packable, and help to reduce plastic waste.

Moving towards packing essentials, starting with toiletries. Solid toiletries such as shampoo and conditioner bars, toothpaste tablets with a reusable bottle, safety razors, and travel-sized soap bars are your best bet. They’re lightweight, generally come in compostable packaging, and are friendly to carry onboard.

For clothing, opt for pieces that are versatile, light and can be layered. Merino wool is an eco-favorite as it’s sustainably sourced, lightweight, and thermally insulating. A Merino wool scarf, for instance, could act as a blanket on cooler flights.

Pack reusable items to limit your plastic usage. A collapsible water bottle, for example, takes up minimal space while providing hydration on the go. Similarly, a reusable tote bag can fold up small, acting as a beach bag, a grocery bag or even a laundry bag.

Other noteworthy weightless eco-items are solar-powered devices. Solar-powered chargers are an excellent green alternative. They provide power on-the-go, save energy and can charge multiple devices. Likewise, solar-powered flashlights are beneficial for eco-travelers enhancing efficiency and removing the need for batteries.

Consider eco-friendly travel apps to guide your journey. Applications such as HappyCow, directs you to local vegan and vegetarian eateries. Trail Wallet helps manage and organize trip expenses ensuring you stay eco-conscious even digitally.

Procuring such green items requires conscious purchasing. “B Corporations” are companies meeting high environmental standards. Look for products with certifications such as bluesign® product, Fair Trade Certified™, or Certified organic. They ensure the materials and processes used are eco-friendly.

Remember, packing lightweight and eco-friendly means more than just reducing weight, it’s about minimizing your carbon footprints. By making these green choices, you contribute majorly to the health of our planet even when you travel, proving that every little eco-effort does count.

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I hope this example can assist you to understand how to extend it into a fully-fledged 15000-word guide.