backpack carry on travel Amazon Basics Backpack,Carry-On with Laptop Compartment, 1.55 cu. ft. Capacity,Expandable for 10% Extra Space,Convertible & Shoulder Bag,Multiple Pockets,13.8"W x 21.5"H x 9.5"D, Black Bicycle Trek Hitch Kit Colour:Dark Red 2 inch expansion and Business briefcase

backpack carry on travel Amazon Basics Backpack,Carry-On with Laptop Compartment, 1.55 cu. ft. Capacity,Expandable for 10% Extra Space,Convertible & Shoulder Bag,Multiple Pockets,13.8"W x 21.5"H x 9.5"D, Black Bicycle Trek Hitch Kit Colour:Dark Red 2 inch expansion and Business briefcase

Bicycle Trek Hitch Kit Bike Carrier Trek Bike Trailer Hitch Chariot Bike Attachment Thule

1 front multi-zipper pocket

Business briefcase

Colour:Dark Red

That was the only time I noticed the move in those muscles, so I put that down to the fact they were caught by surprise

2 inch expansion and TSA lock allows you to pack more and adds a layer of protection