The VesicaA(R) is a collapsible, reusable, and light water bottle that behaves like a hard bottle for easy drinking on the move. The Vesica carries 1 liter of water when full and stows away small while empty, making it the ideal travel bottle. Simply tuck it in your pack or suitcase while not in use and expand when ready to fill! Featuring a collapsible body with a stiff neck and bottom, the Vesica can stand when full with water or air, held for drinking and collapsed when empty. The 28mm thread version can be used with filters like the Sawyer squeeze or HydroBlu. The 42mm thread version can be used with filters like the BeFree. Research your specific filter to ensure you have the right thread diameter bottle and necessary attachments to make it work. Features Packable and easily stashable when empty Lightweight at only 60g for a 1 liter bottle Top string near the cap for easy pull from side pockets Tethered cap The 28mm thread attaches to filters such as the Sawyer Squeeze, Mini, or Micro, the LifeStraw Flex, and the HydroBlu Versa Flow. The 42mm thread attaches to filters such as the Katadyn Be Free. Robust and durable utilizing a thick 0.4mm TPU BPA, BPS, and BPF free Specifications Capacity: 1 liters / 32 oz Packed size: 4x2.9x2.9 in / 10x7.4x7.4 cm Trail size: 10x2.9x2.9 in / 25.5x7.4x7.4 cm Weight: 60 g / 2.1 oz Made from FDA approved TPU BPA, BPF and BPS free Operational temperatures: 20AdegF (-6AdegC) to 212AdegF (100AdegC). This container can hold boiled liquids (212AdegF /100AdegC) but it is recommended to use lower temperatures (176AdegF /80AdegC) to avoid burns and material fatigue. Handmade in China