Review on Hydrapak SoftFlask 750 ml - Ultra-portable Collapsible Water Bottle for Hiking and Running - 25 oz Leak-proof Container by Kris Feezy

Since Katadyn doesn't sell replacement bottles for their BeFree filtration system, I went with the SoftFlask Hydropak 750ml hoping it would work just as well. Compared to the Hydrapak 1 liter bottle that comes with the Katadyn I would say this bottle is a bit thicker and stronger. It also has harder plastic caps on each end to make the bottle more rigid and protect high-wear areas from wear and tear, which is pretty nice to see. Even with the addition of hard plastic, it's still quite compact. For gram counters, the SoftFlask 750 weighs 63 g (2.2 oz). However, if you remove the finger grip and cap, you can reduce it to 40 g (1.4 oz). The disassembled SoftFlask with the BeFree filter installed weighs 80 g (2.8 oz), which is not much more than the weight of the BeFree 1.0 system (2.3 oz). You get a slightly smaller bottle but thicker and more durable. Haven't had it long enough to appreciate the longevity of the bottle but my first impressions are positive and it works well when used with the BeFree filter ie doesn't flow through the thread.