How to Carry Gear on the Outside of a Bag (and Why the Beaver Tail Still Wins)

The best way to carry gear on the outside of a bag depends on what you're hauling and where you’re going. 

Four systems dominate: a shock cord web, a kangaroo (stretch-mesh) pouch, MOLLE webbing or lash tabs, and (perhaps our favorite) a beaver tail — a structural flap that folds over external gear and buckles down. For mixed use — a damp jacket on the commute, a water bottle on the trail — the beaver tail is the most versatile, because it handles bulky or wet items without wrecking the clean lines of the bag. Here's how each one works, where it came from, and which one we built into the Falcon2L.

First, the problem it solves.

Ever tried stuffing a soaking wet rain shell into a compact bag right next to your pristine mirrorless camera? It's a fast track to a panic attack. On a hybrid-work commute or a weekend urban mission, you inevitably end up with gear that doesn't belong inside the main compartment — a damp jacket, a dripping bottle, a mini tripod. Your hard-use gear and the outside elements need to stay isolated from your critical tech. Call it the separation of Church and State.

External carry is the fix. The trick is matching the system to the way you actually move.

The four ways to carry gear on the outside of a bag

There are four external-carry systems in common use, and each trades off speed, security, and how tactical your bag ends up looking.

The shock cord web is a crisscross of elastic bungee strung across the front panel — you tuck a light layer behind it. The kangaroo pouch is an open-top stretch-mesh or spandex pocket that expands to swallow gear. MOLLE webbing and lash tabs are grids of rigid nylon loops or slotted leather "pig snouts" that let you mechanically clip on carabiners and extra pouches. The beaver tail is an adjustable structural flap that folds over your external load and cinches down with a buckle.

None of these is bad. For specific jobs — ultralight backpacking, pure military use — they're excellent. But everyday carry is about context. Move from the trail to the train to the coworking space and each system shows its trade-offs in durability, load control, and how the bag reads in a room. We've carried all of them. Here's where each one earns its keep:

From War to Weekend Warrior: a short history of the beaver tail

The beaver tail — a flap that folds over external gear and cinches down — doesn't have one tidy origin. The name and the mechanism came from different worlds and met somewhere in the middle. There's no single Wikipedia entry that lays it all out; the story is scattered across muzzleloader leatherwork, 90s pack design, and military kit. So we pieced it together. It's a fractured, fascinating history, and it explains why we still use the design today.

The name (18th–19th century)

The term "beaver tail" started in frontier leatherwork, not the tactical world. Mountain men and frontiersmen carried leather "possibles bags" for their blackpowder, flint, and other necessities, and the protective top flap was often cut into a wide "D" shape that resembled a beaver's tail to protect what was inside. It's a style of flap traditional leatherworkers still sell today under that exact name.

The mechanism (1980s–90s)

The expandable external flap was popularized — and arguably perfected — by load-bearing legend Dana Gleason. Lash-down flaps existed before him, but it was Gleason's "Shove-It" pocket on Dana Design packs, most notably the Bombpack, that made the feature famous: a reinforced flap you could "shove" bulky or wet gear under, outside the main compartment. He later carried the idea into Mystery Ranch as the modular "Stick-It," which is still in production.

The tactical unification (2000s)

During the Global War on Terror, Eagle Industries was building packs around the same expandable-flap idea, and the "beaver tail" name resurfaced. Their Beaver Tail Assault Pack (BTAP) — and its civilian counterpart, the YOTE — used an expandable mesh flap sized to hold a combat helmet. Whether Eagle was consciously nodding to those frontier possibles bags or simply landed on the same descriptive name for a flap that looks like a beaver's tail, the lineage rhymes. The modern tactical beaver tail was born.

How Arterra evolves the beaver tail: the Falcon Wing

Arterra's take on the beaver tail is the Falcon Wing — a structural external flap engineered for fast, one-handed access on a compact hip pack. Historically, beaver tails lived on 30L+ backpacks. Shrinking the idea down to a 2-liter hip pack is where it gets interesting.

We looked hard at sleek slings like the Aer Day Sling 3 and the Evergoods CAS2 — excellent bags, but with no real external carry. Fill a 2-liter interior with your phone, keys, wallet, and power bank, then shed a layer when the weather warms, and you're carrying that windbreaker in your hands. Go the other direction to an 8-liter waist pack like the Mystery Ranch Hip Monkey and you're wearing a front-mounted parachute. The Falcon2L is built for the sweet spot: external capacity without the bulk.

The classic knock on a beaver tail is speed. A buckled flap takes a beat longer to open than an open mesh pouch. The Falcon Wing engineers that beat away with a fast-action buckle that releases the flap one-handed. Unbuckle, the wing opens, the gear's right there, no breaking stride.

The flap also needs structure so it doesn't flop around when empty. The standard Falcon2L uses 840D ballistic nylon for abrasion resistance and a stealthy drape. The Falcon2L PRO steps up to Challenge Sailcloth's ECOPAK, a laminated fabric that adds serious weather resistance while keeping weight to a minimum.

Loaded, the Falcon Wing pulls weight toward your center of gravity. Empty, the structured fabric folds flat against the front panel and effectively vanishes. Maximum expansion when you buy a water bottle or peel off a layer on the trail; clean stealth profile when you walk into an airport terminal or a coffee shop.

FAQ

What is a beaver tail on a bag? 

A beaver tail is an external flap that folds over gear strapped to the outside of a bag and cinches down to hold it in place. It's made for bulky, wet, or odd-shaped items — a helmet, a rain shell, a water bottle — that you don't want inside the main compartment. The name comes from the wide, flat, D-shaped flap that resembles a beaver's tail.

What's the difference between a hip pack and a sling? 

Both are single-strap bags worn across the body, so mechanically they overlap. The practical difference is how they ride: a hip pack is designed to sit low at the waist or hip, while a sling typically rides higher across the chest or back. The Falcon2L is a hip pack, built to carry weight at your center of gravity rather than across your shoulder.

What's the best external carry system for everyday urban use? 

A beaver-tail-style flap is usually the best balance for city carry: it holds a shed layer or a bottle when you need it and folds flat when you don't, so the bag keeps a clean profile. Shock cord and stretch-mesh pouches are lighter and faster but look outdoorsy and wear out under heavy loads. MOLLE is the most secure and modular but reads overtly tactical and can swing and rattle as you walk.

Can you carry a wet jacket without soaking the rest of your gear? 

Yes — that's exactly what external carry is for. A beaver tail or stretch pouch keeps a wet shell on the outside of the bag, isolated from the tech and dry layers inside. On the Falcon2L PRO, the ECOPAK exterior adds weather resistance, so the damp stays where it belongs.

The Bottom Line

There's no single best way to carry gear on the outside of a bag — it comes down to your load and your environment. But for the town-to-trail reality most of us actually live in, a structural flap that expands when you need it and disappears when you don't is hard to beat. That's the bet we made with the Falcon Wing.

If you appreciate this kind of mechanism-first design, keep an eye on what Arterra builds next.