WRELS hydration bottle, 500ml, with a 4cm wide mouth for easy ice insertion. Photos 6-8 show the one I personally use, compared with a SALOMON flask. - Brand: WRELS - Capacity: 500ml - Mouth diameter: 4cm Set of red and blue logos. New, unopened. Returns and exchanges accepted only for initial defects. Please fill with water upon arrival and check for leaks after properly closing. To reduce any odor, dissolve 15g of baking soda in hot water, cool to below 40°C, and then put it in the flask overnight. This will alleviate the smell somewhat, but there may be individual differences. Thank you for viewing. Soft flask, soft flask Salomon, SALOMON, trail running, trail run, mountaineering, hiking, backpack, rucksack, ultra, marathon, triathlon, cycling Capacity...500-999ml