How to Pack for a 3-Day Trip in a Carry-On (Compression Packing Cube Method)

How to Pack for a 3-Day Trip in a Carry-On (The Compression Packing Cube Method)

I’ve been using the same compression packing cube setup for 3 years and 40+ trips. Here’s exactly what’s in my carry-on for any 3-day trip, and how I fit it all in under 30 liters.

The system

4 packing cubes + 1 small electronics pouch. That’s it. Total weight: under 8 lbs packed.

Cube 1: Tops (large)

• 3 t-shirts (rolled, not folded)
• 1 long-sleeve shirt
• 1 light sweater

Rolling vs folding saves about 30% space. Compression zippers on quality cubes (like RAS compression cubes) squeeze another 20%.

Cube 2: Bottoms (medium)

• 1 pair of pants (worn on the plane to save space)
• 1 pair of shorts
• 1 pair of swim trunks (if beach destination)

Cube 3: Underwear & socks (small)

• 3 pairs of underwear
• 3 pairs of socks

Cube 4: Toiletries (small, mesh-top)

• Toothbrush + travel toothpaste
• Deodorant (solid, not liquid)
• Travel shampoo (under 3.4 oz / 100ml)
• Razor + 1 cartridge
• Any medications

Pouch: Electronics (small)

• Phone charger
• Laptop charger (or USB-C multiport)
• Power bank (under 100Wh for carry-on)
• Headphones
• Travel adapter (if international)

Worn items (don’t pack these)

Wear the bulkiest items to save space:

• Jacket or hoodie (even in summer, planes get cold)
• Pants (1 pair)
• Sneakers (1 pair)
• Watch

What’s NOT in my bag

• Hair dryer — every hotel has one
• Books — Kindle or phone
• Full-size shampoo — buy at destination if needed
• Multiple shoes — wear 1 pair, pack flip-flops if beach
• Jewelry — minimize what you bring on trips

Compression cube vs regular packing cube

Regular packing cubes: keep things organized, no compression.

Compression packing cubes: have a second zipper that flattens the cube, removing air. Saves ~20-30% more space.

The catch: compression can wrinkle clothes more (you’re squishing them flat). For business trips, use regular cubes. For vacation/ casual trips, compression is great.

Why I prefer this over a checked bag

• No baggage fees — save $30-60 per flight each way
• No waiting at carousel — walk off the plane and go
• No lost luggage — airline loses 1 in 100 bags
• Faster security — fewer items to scan
• Forces you to pack light — which is the whole point

The full kit I use

• RAS 6-set compression packing cubes ($24.99)
• RAS titanium water bottle (40oz, $29)
• Anker USB-C multiport charger ($35 on Amazon)
• Apple AirTag (1 per bag, $29 each)

Total investment: ~$120 for the system, lasts 5+ years.

Happy packing. Email sales@hkras.com if you have questions about our packing cubes.