Here is an original mailing canister from the Duro Co of Dayton Ohio.
We are assuming this is the Duro Pump Co.
Very old mailing canister with screw on lid, measuring 7 x 3 which contained a sample bottle of an unknown liquid and a Duro Co lining wrap for the bottle.
Please review all the images below for a better description.
The round bottle is clear and measures 5 x 2-1/8 with screw on cap.  
The three items are in good condition considering the age.