>>2038583
it depends on if I have anywhere to be
>tfw frame does not have bottle cage bosses or anywhere to attach fenders or racks
desu I just want half a litre of water and somewhere to keep a rain coat / bike lock and a bunch of barely used bike tools.
plus maebe a handle bar bag to keep snacks in.

>>2040667
>backpack
sore shoulders and cant turn around and see over ur shoulder very well.
shoulder straps slowly wearing though shirt, hectic back sweat.
>carry shit on your bike
messes with the bikes handling, unsprung weight that vibrates over every little bump.
cant lock up your bike because its covered in steal able items that are annoying to haul around
so if its something I dont want shaken to death I put it in a small backpack, then anything that's more bulky than heavy goes into pannier bags.