Size:
25L: 18 x 13 x 6.3" (Fits personal item size 18 x 14 x 8 inch of Spirit Airlines & Frontier Airlines perfectly.)
30L: 18 x 14 x 8" (Fits personal item size 18 x 14 x 8 inch of Spirit Airlines & Frontier Airlines perfectly.)
40L: 20.5 x 13.8 x 8.7" (Fits carry-on item size of United Airlines, Southwest Airlines, Alaska Airlines perfectly.)


Interior Structure:
Left Side Compartment
Full zippered pocket for separate storage

Right Side Compartment
Two mesh pockets help hold small items in place and keep bottles upright


Features:

Slide Over the Luggage:
The pouch as a strap enables the duffel to fit over the handle of common suitcase 18 20 24 26 28 32 inch for easy carrying.
Its external storage pocket offers quick access to small items.

Water-resistent:
Made of water-resistent and thick fabric to protect your gears well from rain or wet.

Double Metal Zippers:
With smooth Reliable zippers, no need to worry any ripping or breaking during trips.

Reinforced Strap:
The straps are reinforced and easy to carry

Extra Padded Shoulder Strap:
Comes with a padded shoulder strap, which can give a more comfortable feeling when carry on shoulder. With removable shoulder strap for multiple purpose.