500mL Locking Cap Flask

I run almost exclusively on roads and do marathons regularly.

works perfectly. Easy to drink from in any position (ie above or below mouth). Fits nicely into the belt. Doesnt leak when locked. Can leak some if not locked. Lock mechanism is easy to manipulate while running. the soft design prevents any rubbing that I have had in the past with hard bottles.

definitely my new favorite flasks for training and racing :)

Super simple great locking flask with a wide lid. 10/10

500mL Locking Cap Flask

As stated on my review on shop, locking soft bottles are key. Pulling the bottles outta the back of a belt will result in your hydration going everywhere unless they have some sort of mechanism to stop water flow. These switch around the nozzle is brilliantly designed and works well. 500ml fits great in the front and back of the 2L belt. (I ordered 2 for now, but most likely will order another 2 as back up or aid station swap out.)