The 50 rating means 1/50th (i.e., 2%) of the UV rays come through
"National Museum of American History, America on the Move Collection: Columbia Light Roadster ordinary bicycle"
Other than the vulnerability to tears in the mesh side pocketscommon in daypacksthe Terravia is built for hard use while keeping a focus on low weight, with 70-denier nylon ripstop in the packs body and 200-denier in the lining , all derived from 100 percent recycled material, plus a PU coating and PFC-free DWR (durable, water-repellant) treatment
From my friend I got a valuable tip to use packing cubes
Brock, Tom, C, Notre Dame, 11814
He does, however, keep one on board just in case