Basic Pack Job: How to Pack Your Main Canopy Without Mistakes

Mandatory disclaimer, and then we'll move on: in Italy, packing the main canopy is not regulated the way the reserve is (which requires an ENAC rigger certificate, under the regulations in force at the time of publication), but that doesn't mean anyone can do it however they like. It means the responsibility falls entirely on you. With years of experience on the packing mat watching people open their bags, I've seen pack jobs creative enough to deserve a spot in a contemporary art exhibition — and I don't mean that as a compliment. This article is for skydivers who already have a few hundred jumps, know their gear, and want to understand the why behind each step, not just the what.

Before You Touch the Canopy: The Pre-Packing Check

The pack job starts before you even lay the canopy on the mat. Open the container and do a quick visual inspection: check the condition of the pilot chute (is the spring intact? is the mesh torn?), look for unusual wear on the closing pin, and inspect the closing loop itself — if it's frayed, replacing it costs next to nothing and could save you from an accidental opening on the plane. Then check the bridle: it should be clean, free of knots, and free of any twists that may have built up over countless jumps. If your container has a BOC (Bottom of Container) pocket, make sure it's in good shape and that the velcro still holds.

Also check the slider: the grommets (the metal rings at the corners) should be smooth, with no burrs or deformation. A slider with a chipped grommet can cause an uneven descent or, worse, gradually cut through the lines over time. This isn't something to check every thousand jumps — look at it every time you pack. It takes thirty seconds.

Laying Out the Canopy: Symmetry and Line Alignment

Lay the canopy on the mat with the bottom skin facing down and the tail toward you. The canopy should be fully spread out: no folded cells, no crossed lines. This is where many people make their first mistake — they're in a hurry and skip the line alignment. The lines need to be separated by group (A, B, C, D, and brakes), checked one by one, and laid out so they don't cross each other. A crossed line that goes undetected at this stage can result in an asymmetric opening or, in worse cases, a partial malfunction.

Bring the slider down to the tail of the canopy, between the lines, and make sure all four grommets are correctly positioned on their respective line groups. The slider should be fully collapsed toward the tail: if it stays inflated or is poorly positioned, its travel during opening will be restricted and you'll end up with a long, uncomfortable opening — or wrecked shoulders, if you're flying a high-performance canopy.

Building the Pack: The Cocoon and Lateral Symmetry

The pack-building phase is where you can tell whether someone understands the logic of a pack job or is just going through the motions. The goal is to create a symmetrical, compact package with a shape that fits cleanly into the deployment bag (D-bag) without creating asymmetric tension. The most widely used technique for modern 9-cell canopies is the pro-pack, though variations like the flat pack exist — less common on high-performance canopies, more typical on student or intermediate ones.

In a pro-pack, the cells are folded laterally toward the center, alternating left and right, creating an accordion-like structure. The key is maintaining symmetry: if one side has more fabric than the other, the package will close unevenly and the canopy may exit the D-bag with a rotation. Keep your hands flat, use your body weight to compress the fabric, and don't leave any trapped air pockets — those are what cause the opening snaps that nobody enjoys.

A note on high-performance canopies (elliptical, high aspect ratio): packing becomes more critical because these canopies are inherently less stable on opening. If you're jumping a high wing loading or elliptical canopy and don't yet have solid packing experience on that specific model, talk to a rigger or someone who knows that canopy well. It's not a matter of pride — it's a matter of physics.

The Deployment Bag: Lines and Closure

Insert the pack into the D-bag with the leading edge facing down (toward the bottom of the bag). The lines are then routed through the rubber bands (the elastic loops on the sides of the D-bag) in sequence, from the group closest to the harness toward the pilot chute. This order isn't arbitrary: it ensures the lines deploy in sequence during opening, reducing the risk of tangles. Each rubber band should hold a reasonable amount of line — not too little (the lines come out before the canopy is fully extracted) and not too much (the rubber bands snap under tension).

The D-bag is closed by folding the side flaps first, then the top flap, which is held in place by the loop that accepts the pilot chute bridle pin. Check that the loop isn't twisted and that the pin seats with the right resistance: too easy means it could open on its own in the plane (a scenario to be avoided with great determination), too hard means the pin won't release cleanly on opening and you'll get a delayed or irregular deployment.

Inserting the D-Bag into the Container: Flaps and Closing Loop

Insert the D-bag into the container with the bottom facing down. The container flaps close in a specific sequence — the exact sequence depends on the container model, and if you don't know it, read the manual. I'm not joking: every manufacturer has its own sequence, and reversing it can create asymmetric tension on the closing loop or cause the container to open irregularly. The closing loop must pass through all the flap grommets in the correct order, and the container pin must close with the appropriate resistance.

The closing loop length is a critical parameter that is often underestimated. A loop that's too short makes closing difficult and stresses the flap stitching; one that's too long leaves the container partially open with the risk of an accidental deployment. The correct length is specified by the container manufacturer and should be measured periodically — the loop stretches over time from repeated openings. Replacing it when necessary is the rigger's job, but recognizing when it's out of tolerance is yours.

The Pilot Chute: The Last Step and the Most Critical

The pilot chute is folded and inserted into the BOC pocket (or side pocket, depending on the container) as the final step. A poorly folded pilot chute is one of the most common causes of hesitation or failure to extract the D-bag. The internal spring must be compressed evenly, the mesh must be folded so it won't snag on anything, and the handle (the grip) must be accessible and correctly positioned in the pocket. Do a simulated extraction with your hand — the pilot chute should come out with a firm, deliberate motion, but it shouldn't be so jammed in that it requires a violent yank.

If you have a kill-line pilot chute (collapsible), verify that the kill-line is in the correct position: the pilot chute must be in the 'open' configuration when stowed, not collapsed. A collapsed pilot chute that fails to open after extraction is a serious problem: technically, 'pilot chute in tow' refers to a deployed pilot chute that fails to extract the D-bag, and a collapsed pilot chute that won't open is one of the possible causes of this malfunction, which requires emergency procedures. It's not common, but when it happens because of an avoidable packing error, it weighs heavily on the conscience.

Common Mistakes and How to Recognize Them

After years on the mat, I've mentally catalogued the most frequent mistakes. The first is rushing: a pack job done in ten minutes because you want to catch the next load is statistically worse than one done at a relaxed pace. The second is skipping the line check — bypassing the initial alignment and hoping for the best. The third, and perhaps the most insidious, is packing from memory on a new canopy or a new container: every canopy/container combination has its own characteristics, and what worked with your previous canopy may not be optimal with the new one.

A sign that something is off with your pack job doesn't always come in the form of an outright malfunction. It shows up as a consistently asymmetric opening, a slider that takes too long to come down, or recurring line twists always on the same side. If you notice recurring patterns in your openings, don't immediately blame the canopy or atmospheric conditions — look at your pack job first.

In Summary

Packing the main canopy isn't some mystical procedure reserved for riggers, but it's not something to do on autopilot either. It's a logical sequence with a specific reason behind every step: line alignment ensures an orderly deployment, pack symmetry ensures a balanced opening, and correct closing loop tension ensures the container opens when you want it to — not when it decides to. If you have questions about a specific step, ask a rigger at your DZ before your next jump, not after. And if you're packing on your own for the first time, have an experienced person alongside you for the first few sessions: watching someone who knows what they're doing is worth more than any article, including this one.