The Oval bottle with karabiner has a capacity of 0.4L & is made from aluminium. The oval bottle comes with a karabiner attached & the oval shape makes it absolutely ideal for wearing on your hip or attaching it to your rucksack. The oval bottle is an ideal size & shape for walking & hiking. Aluminium The aluminium means the bottle is lightweight & convenient to carry around as well as being sturdy & highly durable. Karabiner The attached karabiner means the bottle can be easily attached to the outside of your rucksack or belt loops to save space while travelling. While the oval shape is more comfortable & less bulky to carry around. Capacity The bottle with karabiner holds 0.4 litres of liquid, ideal to keep you hydrated. Easy to carry The flat oval shape of the 0.4L bottle means it is comfortable & practical for wearing on your hip while out walking. The non leak seal means you do not need to worry about any leakages if the bottles ends up upside down in your bag.