Saw those, but assumed it would just ride up from my hips onto my belly and then flail around loosely like my other phone pouch thing, so ordered a Flipbelt instead. Will be glad to get rid of the backpack for commuting!
Once i locked the tightening bit in place with a safety pin this worked well enough, didn't notice it much. Not waterproof (or sweatproof) so had to wrap phone in a sandwich bag too.
Saw those, but assumed it would just ride up from my hips onto my belly and then flail around loosely like my other phone pouch thing, so ordered a Flipbelt instead. Will be glad to get rid of the backpack for commuting!