Why Your Pack Choice Matters More Than You Think
Your backpack is your home on an expedition. It carries everything you need to survive, and it's on your body for 8–12 hours a day. A poor fit or wrong volume leads to back pain, inefficiency, and in extreme environments, genuine safety risks. Choosing the right pack is one of the most important gear decisions you'll make.
Understanding Capacity: How Many Litres Do You Need?
Pack volume is measured in litres and should match the length and nature of your expedition:
| Trip Type | Recommended Volume |
|---|---|
| Day hike / summit push | 20–35L |
| Weekend (2–3 nights) | 35–50L |
| Multi-day trek (4–7 nights) | 50–65L |
| Extended expedition (7+ nights) | 65–80L+ |
| Polar or high-altitude expedition | 80–110L |
Resist the temptation to buy the largest pack available — bigger packs encourage overpacking, which leads to injury and fatigue.
Frame Types Explained
External Frame
Rarely used today, but useful for extremely heavy loads (portering gear to base camp). Excellent ventilation and load transfer, but awkward in technical terrain.
Internal Frame
The standard for most expeditions. The frame (usually aluminium stays or a framesheet) sits inside the pack, keeping the load close to your body. Better balance on uneven terrain.
Frameless
Ultralight packs for fast-and-light alpinism or ultrarunning. Suitable only for lighter loads (under ~10kg) and experienced packers who know how to compress gear efficiently.
Fit: The Most Critical Factor
No feature matters more than fit. Key measurements:
- Torso length: Measured from the C7 vertebra (base of neck) to the iliac crest. Most packs come in S/M/L torso sizes or are fully adjustable.
- Hip belt fit: The hipbelt padding should wrap around your iliac crest, not your waist. Up to 80% of load should transfer through the hips, not shoulders.
- Shoulder strap angle: Straps should leave the pack at shoulder height, not below it.
Always try on a pack loaded with weight before purchasing. Many outdoor retailers offer sandbags or demo gear for this purpose.
Key Features to Look For
- Hipbelt pockets: Essential for quick-access items (snacks, phone, compass)
- Lid compartment / floating lid: Useful for top-loading packs
- Front panel access / U-zip: Invaluable for multi-day trips to avoid unpacking everything
- Hydration sleeve and port: Convenient for moving through terrain
- Daisy chains and lash points: For attaching crampons, ice axes, trekking poles
- Rain cover: Integrated or included — critical for wet environments
Weight vs. Durability Trade-off
Ultralight packs (made from Dyneema or thin ripstop nylon) save weight but sacrifice durability. In expedition environments — scrambling over rock, loading into small planes, dragging through brush — a pack made from heavier 500D+ Cordura or ballistic nylon will last far longer. Match your material choice to your terrain.
Summary
The right expedition pack fits your body perfectly, matches your trip length, and is built for your specific environment. Don't buy on brand alone — prioritise fit, volume, and durability for the conditions you'll actually face.