--- product_id: 569084029 title: "Boulder Flask" brand: "gsi outdoors" price: "€ 35.82" currency: EUR in_stock: true reviews_count: 13 category: "Gsi Outdoors" url: https://www.desertcart.ie/products/569084029-boulder-flask store_origin: IE region: Ireland --- # Slim rectangular fits tight spaces 10 oz perfect sip size Durable copolyester build Boulder Flask **Brand:** gsi outdoors **Price:** € 35.82 **Availability:** ✅ In Stock ## Summary > 🥤 Stay hydrated, stay ahead — the flask that fits your hustle. ## Quick Answers - **What is this?** Boulder Flask by gsi outdoors - **How much does it cost?** € 35.82 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/569084029-boulder-flask) ## Best For - gsi outdoors enthusiasts ## Why This Product - Trusted gsi outdoors brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Taste-Pure Material:** No lingering flavors after rinsing, keeping your drinks fresh and true to taste every time. - • **Leakproof Confidence:** Secure screw-top cap ensures zero spills, so you stay refreshed without the mess. - • **Textured Grip with Style:** Rubberized exterior adds a splash of color and cushioned grip, perfect for adventurous professionals who value both form and function. - • **Durability Meets Sustainability:** Crafted from tough copolyester and silicone with eco-conscious manufacturing—built to last and respect the planet. - • **Compact Hydration, Maximum Mobility:** Slim, flat design slips effortlessly into jacket pockets and backpacks for on-the-go convenience. ## Overview The GSI Outdoors Boulder Flask 10 Oz Graphite is a sleek, durable hydration companion designed for active professionals. Made from eco-friendly copolyester and silicone, it features a leakproof screw cap and a slim rectangular shape that fits snugly in pockets and bags. With a 10 oz capacity, it balances portability and hydration perfectly, while its rubberized exterior offers grip and style for every outdoor or urban adventure. ## Description desertcart.com : GSI Outdoors 79346 Boulder Flask 10 Oz Graphite : Sports & Outdoors Review: Great flask!! - This is the best plastic flask I have bought. Highly recommend for the use and the durability. No leak, easy to unscrew the top and easy fill. Fits perfectly in a jacket pocket and not detectable with metal detectors (wink,wink). Review: Great for snug spaces! - Great little water bottle if you're a little tight on space, since a more flat-ish shape works nicely in a lot of the bags I use. 10oz is a good amount for sipping on or just getting you through a few hours outside before your next fill up, though it'll go quick if you're thirsty! I can't speak to its durability over time, since I haven't had it for very long, though it appears to be all that it's advertised to be! Plastic feels pleasantly firm, the cap doesn't leak (At least mine doesn't), didn't seem to have any lingering flavors after an initial rinse or two, and is a great way to keep an eye on how much I have left to drink! Only thing holding it back for me is that despite the rubberized exterior being a great accent for color and some added cushion, it also makes it a little grippy when trying to slide into bags as well as possibly picking up little bits of dust and debris easily from wherever you set it down. Not a deal breaker for me, but I wouldn't mind seeing another style that's less rubberized! ## Features - Boulder Flask 10 Oz Graphite - We believe food brings us together, sustains our explorations, and, mysteriously, always tastes better when cooked and eaten outside - We’re committed to responsible manufacturing, stewardship of our environment, and design rooted in innovation, efficiency, and durability ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07YVKT4SX | | Best Sellers Rank | #12,920 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #11 in Camping & Hiking Hydration Flasks | | Brand Name | GSI Outdoors | | Color | Multicolor | | Customer Reviews | 4.5 4.5 out of 5 stars (499) | | Finish Types | Polished | | Included Components | GSI Outdoors 79346 Boulder Flask 10 Oz Graphite | | Item Type Name | GSI Outdoors 79346 Boulder Flask 10 Oz Graphite | | Item Weight | 0.26 Pounds | | Manufacturer | GSI Outdoors | | Material Type | Copolyester, Silicone | | Shape | Rectangular | | UPC | 090497793462 | | Unit Count | 1.0 Count | | Volume | 295.74 Milliliters | ## Product Details - **Brand:** GSI Outdoors - **Color:** Multicolor - **Finish Type:** Polished - **Material:** Copolyester, Silicone - **Shape:** Rectangular ## Images ![Boulder Flask - Image 1](https://m.media-amazon.com/images/I/513GFpPCTEL.jpg) ## Available Options This product comes in different **Color, Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great flask!! *by K***T on September 6, 2025* This is the best plastic flask I have bought. Highly recommend for the use and the durability. No leak, easy to unscrew the top and easy fill. Fits perfectly in a jacket pocket and not detectable with metal detectors (wink,wink). ### ⭐⭐⭐⭐⭐ Great for snug spaces! *by S***S on May 19, 2023* Great little water bottle if you're a little tight on space, since a more flat-ish shape works nicely in a lot of the bags I use. 10oz is a good amount for sipping on or just getting you through a few hours outside before your next fill up, though it'll go quick if you're thirsty! I can't speak to its durability over time, since I haven't had it for very long, though it appears to be all that it's advertised to be! Plastic feels pleasantly firm, the cap doesn't leak (At least mine doesn't), didn't seem to have any lingering flavors after an initial rinse or two, and is a great way to keep an eye on how much I have left to drink! Only thing holding it back for me is that despite the rubberized exterior being a great accent for color and some added cushion, it also makes it a little grippy when trying to slide into bags as well as possibly picking up little bits of dust and debris easily from wherever you set it down. Not a deal breaker for me, but I wouldn't mind seeing another style that's less rubberized! ### ⭐⭐⭐⭐⭐ One tough cookie! *by D***G on November 23, 2025* Driving down the road at 55 mph I hear a thump. Looking in my rear view mirror I see something tumbling down the middle of the road behind me. Suddenly I remember setting my flask on top of my car before leaving home. I turn around to retrieve the flask overjoyed to discover that it only suffered a bit of stuffing on the screw cap. This thing really is shatter resistant! Perfect size for those 3 -4 mile walks. Fits nicely in a pocket. --- ## 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.ie/products/569084029-boulder-flask](https://www.desertcart.ie/products/569084029-boulder-flask) --- *Product available on Desertcart Ireland* *Store origin: IE* *Last updated: 2026-06-14*