Peak Design Travel Backpack 20 liters says

Travel Backpack: From weekend to world tour
The Travel Line is a well thought-out luggage system for short trips, business trips and city tours. In addition to the travel backpack variants with 45 and 30 liters, there is also a daypack variant with 20 liters - ideal for hand luggage and as a supplement to the Peak Design rolling suitcase.

Compression zipper and retractable area for changing the packing volume
To offer even more flexibility, the Travel Backpack has a compression zipper on the top. This allows you to adjust the volume from a maximum of 45 to 30 liters (33-27 liters for the 30 liter version and 20-23 liters for the smallest). There are press studs on the inside of the backpack that keep it folded up. In this so-called daypack state, the backpack can only hold packing cubes in the lower section.

Perfectly compatible with modular packing cube units
There is a complete system of packing cubes for the Travel Backpacks, which can be inserted seamlessly into the backpack and make optimum use of the space. The system includes various packing cubes for clothing, photo equipment, electronic gadgets, shoes and personal care items. You can freely combine the packing cubes to suit your trip. Each small packing cube counts as one modular unit. For example: the small Camera Cube counts as one module unit, while a fully packed Packing Cube Medium counts as two module units. In the standard configuration, both the 45 liter and the 30 liter backpack can hold three module units - or, for example, a Medium Camera Cube and a Packing Cube. The 45-liter version can also hold a Wash or Tech Pouch. The small 20 liter backpack can hold an S-Medium Cube in its standard configuration or the slightly larger Medium Cube in the extended configuration.

Ergonomic shoulder straps with swivel joints for an optimum fit on the body and hip belt
The Travel Backpack has ergonomic shoulder straps with swivel joints. The joints ensure an optimum fit on the body. In addition, a short chest strap is included, which can be used to connect the two shoulder straps crosswise at chest height, making the backpack sit even more securely on the body. A length-adjustable hip belt is also available as a separate accessory. This transfers part of the weight of the rucksack to the hip area to further relieve the back. The hip belt is equipped with a small zippered pocket and accessory loops for a capture clip or range pouch pockets. Length adjustability is a matter of course in both cases.

Foldable back pad with storage space to conceal the shoulder and hip straps (45 / 30 liters)
The foldable back pad is also versatile and adaptable. You can leave it folded out in one layer. It then offers a large area of support. Integrated magnets fix the outer wings of the back padding so that they do not stick out. You can fold the padding in two layers to have more air on your back. There is also the option of stowing the shoulder straps and hip belt behind the pad. This option is ideal if you are carrying the backpack in your hand like a travel bag. For this purpose, there are carrying handles on almost all sides, one of which even functions as a trolley loop.

Lid flap on the back for extensive access
The entire main compartment is accessible via the large back flap with a circumferential zipper - the best way to pack the backpack like a suitcase and much more organized than with conventional backpacks with top-down access. There is a divider in the middle, which has a zipper so that you can open it up to access the main compartment from the front. The divider can be stowed in a compartment provided for this purpose. You then have permanent access to the main compartment from both sides. The position of the lid on the back is also like a built-in anti-theft device when you're out and about.

Versatile extra compartments
Carrying a water bottle or tripod? There are large compartments on each side (45 / 30 liters, separate inner compartment for 20 liters). There is space for devices up to 15 inches in the laptop compartment on the lid flap. At the top there is a practical zippered compartment with pockets for sunglasses, headphones and similar items that need to be within easy reach without cluttering up the rest of your luggage. More luggage than planned? No need to worry! The included cord-hook carrying straps give the bag additional carrying capacity: simply snap the adjustable carrying straps onto the sides. Tripods and other items can be securely attached to the outside and carried along. When you are not using this feature, the straps can be stored in a hidden storage compartment.

Further features

• Notebook compartment on the inside of the back flap. Suitable for notebooks up to 40.6 x 30 x 2.5 cm (45 liters) or 40 x 29.5 x 4 cm (30 liters) or 35 x 28 cm (20 liters)
  Tablet compartment
• Two large compartments on the outside for water bottles or tripods (45 and 30 liters)*
• Countless pockets and zippered compartments. Definitely too many to list them all
• Tension straps and corresponding eyelets for attaching things to the outside of the backpack
• Numerous loops on the inside for attaching the packing cubes via so-called C-clips
• Exterior made from a robust nylon fabric with a fabric thickness of 400D
• DWR-impregnated and PU-coated inside
• Waterproof zippers with various security devices as anti-theft protection
• Lightweight foam elements as inner padding.
• Extremely robust, weatherproof lining on the underside

Scope of delivery
1x Travel Backpack Black
2x external straps for the Cord-Hook system
1x chest strap