Alco Co., Ltd. (Headquarters: Osaka City, Osaka; President and Representative Director: Masahiro Furihata), which imports, wholesales, and retails apparel-related products mainly from the United States, will begin selling new 300ml and 400ml sizes from the “Micro Hydro” series by insulated stainless steel bottle brand Hydro Flask®. The new sizes retain the slim silhouette of the existing popular 200ml model, designed to fit easily into pockets or narrow spaces in bags, while offering capacities suited to a wider range of everyday situations. Key features include an ideal slim form that secures practical capacity while remaining surprisingly slender, making hydration easy during commuting, school, or short outings without added bulk. The bottles also feature a removable “FlexClip™” bottle strap, allowing quick attachment to bag handles or belt loops for more comfortable hands-free movement. Both 300ml and 400ml models are available in White, Oat, Trillium, Popstar Pink, Cloud Pink, Mermaid Green, Agave, Shale Gray, Capri Blue, Harbor Blue, Birch, and Black. The 300ml Micro Hydro is priced at ¥4,290 including tax, while the 400ml Micro Hydro is priced at ¥5,170 including tax. The products will launch first at directly operated stores and the official online store from Thursday, May 14, followed by nationwide release from Wednesday, June 17. Sales channels include directly operated stores, the official online store, and authorized retailers across Japan. Hydro Flask was born in Bend, Oregon, an area known for its strong outdoor and craft beer culture. Since launching its insulated bottle capable of keeping drinks cold or hot in 2009, the brand has rapidly grown through product appeal and unique PR strategies. Today, Hydro Flask offers a broad lineup including bottles, accessories, lightweight outdoor bottles, cutlery, and outing-oriented soft goods, with a mission to deliver refreshment beyond expectation to the world.