Pouch for messenger bag strap

[ireknole]

I just took the plunge and purchased a Timbuk2 command messenger bag. I'd like to attach a velcro accessory pouch to the strap to hold my phone and some cash for easy access. Timbuk2 makes pouches for this purpose (the 3-way or shagg bag), but unfortunately, the largest sizes they offer (medium) are too small for the s5. Does anyone have any suggestions for another pouch that will work? Thanks!

Sent from my SM-G900V using Tapatalk