A strip along the centre seam plus one across each end edge, making an H. It closes every seam on that face.

Is one strip on the bottom ever enough?

For light, small boxes it may hold, but for moving, the end edges are where boxes split. H-taping the bottom is the safer habit.

Which tape should I use for moving boxes?

Packing tape made for cartons, typically 48 mm (1.88 in) wide. Wider tape covers more of the edge; it doesn’t change how long each strip is.

Should I tape the top of the box the same way?

Yes. Stacked and carried boxes get pressure from every side, and an H-taped top keeps flaps closed when a box is tipped.

Is a tape gun worth it?

For more than a few boxes, yes: it cuts cleanly, keeps strips straight, and wastes less tape.

Illustration of a moving box bottom H-taped with a center seam strip and two end-edge strips

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How to Properly Tape Moving Boxes

A moving box fails at its weakest seam, and the weakest seams are the ones most people leave untaped. Taping a box properly takes about a minute and a little more tape, and it is the difference between a box that arrives and one that drops its contents in the stairwell. This guide covers building the box, the H pattern, reinforcing heavy boxes, and the common mistakes.

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Build the bottom first

Open the box and fold the two short flaps in, then the two long flaps over them, so the long flaps meet in a seam down the middle.
Run a strip along that seam, starting a few inches down one side and finishing a few inches down the other.
Run a strip across each end edge, where the flaps meet the end panels, again down the sides.
Turn the box over and press every strip down firmly, especially the tabs.

Why the H pattern

A single strip holds the two long flaps together but leaves the short ends open. Under weight, the flaps bow and the corners split — usually at an end. The two edge strips close those ends, turning the bottom into one panel. On a medium 18 × 18 in box, H-taping the bottom uses 69 in of tape instead of 23 in; that extra 46 in is cheap compared with a box of dishes on the floor.

Heavy boxes: reinforce, don’t overfill

Add strips across the bottom seam for books, tools, and kitchenware. Each strip across a medium box’s bottom is 23 in with 2.5 in tabs.
A second strip on the centre seam (double H) adds strength where the flaps meet.
Use smaller boxes for heavy things. Tape can’t fix a box too heavy to lift safely.
Fill gaps so the top doesn’t sink; a box crushed from above splits its tape too.

Tabs: how far down the side

Each strip should run a little way down the sides so it grips the panels as well as the flaps. A few inches is common. Longer tabs hold better and use more: H-taping a box top and bottom has twelve tab ends, so every extra inch of tab adds 12 in of tape to each box.

Common mistakes

Folding the flaps over and under each other instead of taping them; it weakens the box and hides a gap.
Using office tape or masking tape, which doesn’t hold cardboard under load.
Taping over old labels and tape from a used box without checking the flaps are sound.
Leaving tape ends loose — they catch on other boxes and peel.

Taping Moving Boxes FAQ

What is H-taping?: A strip along the centre seam plus one across each end edge, making an H. It closes every seam on that face.
Is one strip on the bottom ever enough?: For light, small boxes it may hold, but for moving, the end edges are where boxes split. H-taping the bottom is the safer habit.
Which tape should I use for moving boxes?: Packing tape made for cartons, typically 48 mm (1.88 in) wide. Wider tape covers more of the edge; it doesn’t change how long each strip is.
Should I tape the top of the box the same way?: Yes. Stacked and carried boxes get pressure from every side, and an H-taped top keeps flaps closed when a box is tipped.
Is a tape gun worth it?: For more than a few boxes, yes: it cuts cleanly, keeps strips straight, and wastes less tape.