Originally Posted by
csrpenfab
I really like my Revelate Designs top tube mount "Bento Box" Easily holds my phone, wallet, an energy bar, etc. with room to spare. Both my road and gravel bike have flat top tubes, so it stays put well. The magnetic catch makes it quite easy to access while on the move too.
I recently installed the same bag on my gray Trek. hah. It's working out very well. I normally drop my clothes/shoes and other big stuff off at work ahead time so i use this to simply carry phone/key/wallet/badge/sunglasses on my commute. It's basically a glove box for your bike. The only minor con is that you have to be a little careful when standing over the bike.