Oasis Hydration Backpacks By Teton Sports, Available In 18 And 22, Or Biking. Here?s what we?ve heard: It?s the perfect size, you can quickly bungee a helmet or coat to the back, and it carries enough water for a full day of adventure. TETON has taken its original (and extremely popular) hydration pack and made it even better. With two sizes, you can find the ideal pack to meet the demands of your next adventures, whether that?s a day hike, festival, or really long walk. Bonus: The color choices are dreamy. WATER NEVER TASTED SO GOOD: During a long hike having water so convenient and still cold?there?s nothing like it. Lightweight with a custom fit, you?ll forget you have it on until you need it.18L pack give you plenty of storage for your day hike HYDRATION BLADDER INCLUDED: 2-liter water bladder included; Complete with durable, kink-free sip tube and innovative push-lock cushioned bite valve; Large 2-inch (5 cm) opening for ice that also makes cleaning easy GET THE PERFECT FIT: Low-profile athletic cut with full adjustment fits all body types comfortably; Comfort-taped straps with high-density notched foam stabilizer and mesh covering means you can wear this pack comfortably for hours, Water backpack for hiking fits men, women, and youth LOADED WITH FEATURES: 18 Liter hiking backpack with hydration bladder; Large pocket with a hidden-teeth zipper: Weather guard protects everything you?re packing; Bungee cord system for bike helmet; Butterfly opening for jackets, etc. TETON SPORTS PROMISE: Reach out to our AMAZING product support team if you have any questions or concerns; YOU CAN COUNT ON US to get you taken care of and back OUTDOORS