--- product_id: 253942416 title: "Waterdrop Gravity Water Filter Straw, Portable Water Purifier Survival for Camping, Hiking, Backpacking and Emergency Preparedness" brand: "waterdrop" price: "¥18497" currency: JPY in_stock: true reviews_count: 5 category: "Waterdrop" url: https://www.desertcart.jp/products/253942416-waterdrop-gravity-water-filter-straw-portable-water-purifier-survival-camping store_origin: JP region: Japan --- # 700 ml/min max flow rate 0.1μm ultrafiltration membrane 1.5 gal gravity-fed water bag Waterdrop Gravity Water Filter Straw, Portable Water Purifier Survival for Camping, Hiking, Backpacking and Emergency Preparedness **Brand:** waterdrop **Price:** ¥18497 **Availability:** ✅ In Stock ## Summary > 💦 Stay ahead of the pack with gravity-fed purity on the go! ## Quick Answers - **What is this?** Waterdrop Gravity Water Filter Straw, Portable Water Purifier Survival for Camping, Hiking, Backpacking and Emergency Preparedness by waterdrop - **How much does it cost?** ¥18497 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/253942416-waterdrop-gravity-water-filter-straw-portable-water-purifier-survival-camping) ## Best For - waterdrop enthusiasts ## Why This Product - Trusted waterdrop brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Rapid Flow Rate:** Enjoy up to 700 ml/min for quick, hassle-free water access in the wild. - • **Backwash & Reuse Tech:** Innovative self-cleaning extends filter life up to 1,400 gallons—eco-smart & reliable. - • **Massive 1.5 Gallon Capacity:** Stay hydrated all day with 11 bottles worth of purified water on demand. - • **Ultra-Fine Filtration Power:** Eliminates chlorine, sediment & odors for pristine hydration. - • **Versatile Outdoor Companion:** Fits water bags & bottles seamlessly—clean water anytime, anywhere. ## Overview The Waterdrop Gravity Water Filter Straw is a portable, non-electric purifier featuring a 0.1-micron hollow fiber membrane that removes harmful contaminants and improves taste. Paired with a 1.5-gallon gravity-fed water bag, it delivers up to 700 ml/min flow rate and supports up to 1,400 gallons of safe drinking water. Its backwash function ensures easy maintenance and long-term use, making it an essential survival and outdoor hydration tool. ## Description How to backwash Backwashing is essential for keeping the Filterstraw in good condition and making it easy to use multiple times. After drinking, blow air through the mouthpiece frequently, or drain the Filterstraw by shaking out as much water as you can. After using, remove the mouthpiece and flush it with clean water. (A standard water bag can be used, or a pop bottle with a standard thread diameter of 27.5mm can be filled with clean water to backwash the Filterstraw.) Cap the filter tightly after it has dried. Note: Do not use chemicals to clean the Filterstraw because they will shorten the service life of the carbon fiber filter. Working principle There are many micro-fibrous tubes in the 0.1-micron hollow fiber filters. They can prevent protozoa from going through the outer walls of the tubes, while water can easily pass through them. The principle of micro-fibrous tubes is similar to that of medical dialysis technology. Therefore, water going through the Filterstraw will be clean and safe. Review: Excellent. Been using it camping for months now. Not been sick, despite deer where I camp Review: Arrived as expected and in prestine state. Haven't tested the filter yet though ## Features - 5-Stage Efficient Filtration: With adoption of premium-quality 0.1 um ultrafiltration membrane and other raw materials, the Water Filter Straw can effectively reduce harmful substances like chlorine, particulates, sediment, stones, sand, dirt, bad taste &odor in water to ensure the water safety and deliver better drinking experience. - Professional Combination: Waterdrop Gravity Water Filter Straw with 1.5 gal Gravity-Fed Water Bag is an exclusive water purification combination created for outdoor activities and first aid survival. The large-capacity water bag can hold up to 1.5 Gallons of water at a time, which is about 11 bottles of 500 ml bottled purified water, and can meet the all-day demand for outdoor water drinking. - Longer Lifespan: The Waterdrop Filter straw can provide safe drinking water up to 1,400 gallons (5,300 liters), and ensures the maximum water flow rate of up to 700 ml/min to provide more relaxed outdoor water drinking experience. - Recyclable Straw: With innovative backwash purifier function, the inside of the Water Filter Straw can be kept clean at all times and it is recyclable, safe and pollution-free. If the water flow decreases or the filter has been used for a long time, you can remove the mouthpiece, flush it with clean water. (Standard water bag can be used or pop bottle with thread diameter of 27.5mm can be filled clean water for backwashing the filter straw.) - Versatile Uses: The Water Filter Straw can be connected with water bags or water bottles to filter water for drinking. Both ends of it can be disassembled and connected with the water bags and the water bottles to offer you clean drinking water anytime anywhere. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B086QNLBB4 | | Best Sellers Rank | #11,797 in Sporting Goods ( See Top 100 in Sporting Goods ) #13 in Camping & Hiking Water Filters | | Brand Name | Waterdrop | | Capacity | 1.5 Gallons | | Container Type | Tasche | | Customer Reviews | 4.6 4.6 out of 5 stars (2,821) | | Included Components | 1 x Wasserfilter-Strohhalm, 1 x 1,5 Liter Wasserbeutel, 1 x 473 ml Wasserbeutel | | Installation Type | Freestanding | | Item Dimensions L x W x H | 17.2L x 8.6W x 27.7H centimeters | | Item Weight | 0.29 Pounds | | Manufacturer | Waterdrop | | Material Type | Activated Carbon | | Maximum Flow Rate | 700 Milliliters Per Minute | | Model Name | WD-FSBUL | | Model Number | WD-FSBUL-1 | | Other Special Features of the Product | Chlorine Reduction | | Part Number | WD-FSBUL-1 | | Power Source | Non Electric | | Purification Method | Hollow Fiber Membrane | | Supported Water TDS Level Maximum (PPM) | 1000 | | UPC | 840814172988 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Waterdrop - **Capacity:** 1.5 Gallons - **Material:** Activated Carbon - **Product dimensions:** 17.2L x 8.6W x 27.7H centimeters - **Special features:** Chlorine Reduction ## Images ![Waterdrop Gravity Water Filter Straw, Portable Water Purifier Survival for Camping, Hiking, Backpacking and Emergency Preparedness - Image 1](https://m.media-amazon.com/images/I/61QubWlo4gL.jpg) ## Available Options This product comes in different **Color** options. ## Questions & Answers **Q: does it protect against Giardia lamblia? Thanks** A: Yes **Q: How much does this weigh?** A: Hi Shawn, Thank you so much for your interest in our product. The item's gross weight is 1.09 pounds. If you have any other inquiries, please feel free to contact us at 1-888-352-3558 (8:00 AM - 5:00 PM PST, Mon - Fri). Thank you. Kind Regards Mia Lauren Customer Service Rep **Q: how long does this product last? 1 day? 1 month?** A: I used it for the first time this weekend. On a backpacking trip. I thought it was useful to have in addition to a filter pump to bring water back to Camp. It seemed well-made, how long it will last Would probably depend on how dirty the water is that you put through it ,if you clean it consistently and if you were careful not to abuse it. But I will get $20 worth of use out of it for sure. I expect it to last me for multiple trips. **Q: Does it come with the bag?** A: Hi Mike, Thank you for your interest in our Water Filter Straw. Yes, the item comes with two bags. One is the blue gravity water bag which is used to fill with the raw water, another is white used to fill with the filtered water. They are connected via the straw to filter the water for drinking. If you have any other questions, please feel free to give us a call between the hours of 8:00 AM-5: 00 PM (PST), Monday through Friday at 1-888-352-3558. We will try our best to help you out. Thank you very much. Best Regards, Mia Lauren ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by S***) on 11 March 2026* Excellent. Been using it camping for months now. Not been sick, despite deer where I camp ### ⭐⭐⭐⭐⭐ Review *by M***S on 2 February 2026* Arrived as expected and in prestine state. Haven't tested the filter yet though ### ⭐⭐⭐⭐⭐ Review *by R***E on 6 April 2026* 5/5 Stars – Very impressed with this gravity water filter! Took this portable gravity-fed water filter hiking and it performed great. Just hang it up, let gravity do the work, and in just a few minutes you have clean, great-tasting water from streams or lakes – no pumping required. It filtered murky water without clogging, was super lightweight and easy to pack, and the flow rate was excellent. My whole group stayed hydrated all day without any stomach issues. Perfect for backpacking, camping, or emergency use. If you hike a lot, this is a game-changer. Highly recommend ## Frequently Bought Together - Waterdrop Gravity Water Filter Straw, Camping Water Filtration System, Water Purifier Survival for Travel, Backpacking and Emergency Preparedness, 1.5 gal Bag, 0.1 Micron, 5 Stage Filtration, Blue - Aquatabs 397mg Water Purification Tablets (100 Pack). Water Filtration System for, Camping, Boating, Emergencies, Survival, RVs, and Marine-Use. Easy to Use Treatment and Disinfection. - LifeStraw Personal Water Purifier for Hiking, Camping, Travel, and Emergency Preparedness --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/253942416-waterdrop-gravity-water-filter-straw-portable-water-purifier-survival-camping](https://www.desertcart.jp/products/253942416-waterdrop-gravity-water-filter-straw-portable-water-purifier-survival-camping) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-05-21*