Most bag collaborations change a color and add a second logo. This one changes how the bags work together. N.HOOLYWOOD's military line, TEST PRODUCT EXCHANGE SERVICE, and PORTER have made four bags that dock into one another: a helmet bag, a backpack, a drawstring bag and a pouch. Each comes in black or beige and is on sale now at N.HOOLYWOOD's online store.

Why PORTER bags are built the way they are
PORTER is the in-house brand of Yoshida & Co., the Tokyo bag company Kichizo Yoshida founded in 1935. The PORTER name arrived in 1962, and N.HOOLYWOOD's feature on the collaboration explains it well: hotel porters handle luggage all day, so they know a good bag from a bad one better than anyone. The company works under a motto about putting your whole heart into every single stitch, and its bags are still made with that kind of care in Japan.
The base for this project is PORTER ALL, a system of bags and pouches designed to be mixed and clipped together to suit how you carry. N.HOOLYWOOD took that idea and pushed it through the lens of military kit, where modular gear has always made sense.
The PORTER x N.HOOLYWOOD helmet bag
The helmet bag is the signature piece, a 22.5 liter tote based on the bags pilots used to carry their helmets. The main compartment closes with snap buttons for quick access. There are large pockets inside and out, plus a mesh pocket inside for small things. A loop under the front flap pocket takes the collaboration pouch or any PORTER ALL pouch.
Here is the detail most people will miss. The detachable shoulder strap uses an adjuster Yoshida designed itself, which lets you lengthen or shorten the strap in one smooth motion. It is patented in Japan (patent No. 6698930) and protected as a registered design. Few bag makers bother to invent their own hardware.

The backpack, drawstring bag and pouch
- Backpack (25 liters): slightly slanted when you look at it from the side, with two main compartments, a mesh pocket at the top of the front one and a stretch mesh sleeve for a laptop or tablet in the back. A small triangular gusset where the straps meet the body helps it sit better.
- Drawstring bag (4.8 liters): uses the same patented strap adjuster, adds a side-access outer pocket, and takes a pouch on its front loop or side D-ring.
- Pouch: sized for a phone and small items, with a mesh front and a cord to wear it around your neck. It docks onto the other three bags, onto PORTER ALL pieces and onto the flight jacket from the same collection.

All four use PORTER's own fabric, a 66 nylon woven at very high density for a quiet sheen, lined with a cotton-bonded nylon ripstop that feels soft against clothes. If you want to know what fabric numbers like that mean in practice, our guide to backpack fabrics breaks it down, and our backpack sizes explainer shows what 25 liters actually holds.

Our call: buy the backpack. The helmet bag is the more striking object, but the backpack is the one you will use every day, with a real laptop sleeve, a sensible size and the same docking system. Add the pouch only if you will clip it on. On its own it is just a nice phone case. If you already own PORTER ALL pieces, any of these will extend what you have, which is the whole point.