Hydriam 750ml Flask, 42mm, blue

Features: - Rolls up small when empty - Our lightest water carrying container - Easy to fill and simple to clean and dry due to the wide opening -Tapered design to easily fit in running vest pockets - Tethered cap - Attaches to filters with a 42 mm thread, such as the Katadyn BeFree - Robust and durable, utilizing the same material as the Vecto - BPA, BPF and BPS free