Review on TPU Folding Flask: TRIWONDER Soft Flasks Collapsible Water Bottles For Hydration Pack - Ideal For Running, Hiking, Cycling & Climbing by Jamal Webb

These soft folding water bottles worked really well for an endurance obstacle course race I just competed in. I used them while competing for about 7 hours. They did solid overall. They were easily fillable and worked well in my hydration vest. The only issue I had with them is the bit valve to drink the fluids inside of them was very tough and didn't allow a very strong flow when trying to drink. This resulted in me removing the lid to drink faster/more than what I could get from sucking. Knowing this, I'd still recommend these and for people looking for a reasonably priced soft folding water bottle option.