PORTABLE & PACKABLE: Crush the Seeker Hydration Reservoir when empty and store in the included storage bag. The flexible design makes it so light and compact, you'll forget it's in your pack. DURABLE & VERSATILE: Made of flexible and abrasive-resistant TPU, the Seeker can be frozen to use as an ice pack, filled with hot water (max temp 60°C/140°F), or kept in your camp kit as your go-to filter bag. EASY TO USE: Low-profile, weather resistant handle and load-bearing lashpoints make this hydration reservoir easy to handle, pour, and carry; the large 42mm opening makes it easy to fill. WATER FILTER COMPATIBLE: Filter more water in the backcountry, most 42mm threaded filters, including HydraPak's 42mm Filter Cap. LIFETIME WARRANTY: Beyond Lifetime Guarantee covers all reservoirs from manufacturing defects in materials and workmanship for the lifetime of the product.