REVIEW: Haley Strategic D3 Flatpack

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Eagle laid the foundation years ago with the Modular Assault Pack (MAP): a small backpack for ammunition, snacks, and water, divided into a main compartment and a small, attached pocket. The system was wearable with shoulder straps, but also completely integrable with a plate carrier. As the MAP got older, Eagle then introduced the Yote, essentially a MAP on steroids. The most important innovation was the Beavertail, which allowed the backpack volume to be significantly expanded to accommodate items like a helmet or a jacket. From that point on, the One Day Packs or 24h Packs started popping up like mushrooms. First Spear ECP, Mayflower 24h Pack, and Tyr Tactical Combat Sustainment Pack, to name a few. Haley Strategic has now also designed a 24h Pack, the D3 Flatpack. We are excited to be one of the first to get our hands on this pack and be able to introduce it to you.

Since most 24h Packs are quite large and equipped with many (potentially obstructive) buckles and straps, Travis Haley took a different approach. The goal was to make the pack as compact and inconspicuous as possible, while still giving it the ability to expand its volume rapidly. It should also be compatible with the existing parts of the Haley Strategic Partners (HSP) D3 series.

So the D3 Flatpack initially appears very flat in its namesake. The main compartment is 4.5cm deep, and the attached pocket is 1.5cm deep - making it 6cm at its widest point. There are no compression straps or other buckles on it, only zippers - five in total.

The top zipper, just above the Velcro field (21cm x 7.5cm) from the front, is for a flat pocket that extends to the bottom of the pack.

The second zipper opens the attached pocket underneath.

On the side of this, there is another zipper that runs around the pocket entirely.

Opening this expands the attached pocket by 3.5cm, resulting in a depth of approximately 5cm. There are no partitions for organization in this pocket.

Similarly, the main compartment is flat and rather unspectacular.

At the back, there is an inner pocket (about 30cm x 20cm) along with Velcro attachment and hose pass-through, intended for a hydration bladder. Due to the compact shape of the pack, only 1-liter hydration bladders can be used.

Also, an encompassing zipper near the back can expand the entire main compartment for more volume. The depth of the main compartment is then approximately 11.5cm. At the bottom, there is an eyelet for water drainage.

In its compressed state, the Flatpack has a volume of approximately 4 liters, and when fully expanded, a volume of 11.5 liters. Without compression straps, the backpack will inevitably sag when weighted - so it is advisable to pack cleverly when maximizing volume usage. The zippers used to expand the pack also serve another function - compression. By completely relaxing the backpack and filling it with items like a hydration bladder, wind/rain gear, and then closing all zippers again, the air can be removed from the clothes, resulting in a nice, flat package. In the pictures, the backpack is packed with a Level 3 Fleece and the Arcteryx Windshirt + Pants, all in size Large. Whether fully utilizing the volume or compressed, you can see how much air can be removed.

The D3 comes with simple backpack straps, which are not heavily padded due to the volume, which would also be unnecessary.

On the straps, there are elastic loops on the outside to securely hold a hydration tube. The size adjustment is done via Velcro on the upper parts and a Fastex closure on the lower parts.

But the straps are not