AONIJIE 2 Pack Soft Water Bottle, TPU Collapsible Flask Foldable Bottles for Hydration Pack, BPA-Free, for Running Hiking Cycling Climbing (2 Pcs - 500ml)

I have a 50 miler race coming up that requires to carry some sort of water flasks. The race itself is cupless. These are the cheapest and very good quality flasks I found. Overall, I'm impressed by their quality. They are leakproof and comfortable to carry. The bottle are of high quality.I put tailwind and water in it, that was very easy to clean. The ones I bought were 2x 500 ml

Bought these to replace my Salomon flasks- work perfectly. Easy to clean and accessible to drink out of while running. Fit in my vest well.

Very useful, I bought it for my running vest and fit perfectly.

These are great! Love that they fit in my hydration vest pocket so I can have clean water in my vest and electrolytes in these. Only bad thing is they stain with colored electrolytes. But who really cares.

Purchased and used for a Spartan 10K race and worked perfectly!

Great product. Glad I made the purchase.

The bladder is durable and the nipple did not leak and was easy to use. Great product. However, one of the two bottles leaked at the threads when you screw on the nipple. Tried several times to clean and see if it would work, but maybe a defect in the plastic top at the threads. I only needed 1 bottle for my event so no harm because they are inexpensive. Great product when it works properly.

Perfect for a hike - same oz as a water bottle but packs much easier than a plastic bottle or reusable metal.