These bags are designed to neatly fit into the commonly unused void just below the top tube of a typical bicycle frame.  Relatively lightweight and aerodynamic as luggage options go, these durable bags are secured with nylon Velcro straps, and come in 3 convenient sizes to suit most sizes of frame.   

The entire Passport bike packing luggage range delivers functionality with great value.

High quality materials and great features, will enable you to get out in the countryside and start exploring or load up and ride to work for your daily commute.

• Water resistant nylon side panels helps keep the weight down.
• Tarpaulin top and bottom main body material aids durability.
• Water resistant long side zipper allows easy-access.
• Hi-Viz yellow internal lining makes it easier to find items inside.
• Additional internal small zip pocket helps secure keys etc. 
• 3M Reflective logo for added safety.

Specifications

• Volume Small 2.1L, Medium 3.3L, Large 4.8L
• Material 210D Nylon sides panels with 500D Tarpaulin body
• Dimensions Small: 38 x 4.5 x 12.5cm, Medium: 45 x 5.5 x 13.5cm, Large: 51 x 5.5 x 17cm

ADVNTR.cc gave the Passport Bikepacking Range 9/10, describing the range as "PERFORMANCE BEYOND THE ASKING PRICE"