Summit 45 · Technical Pack
Built for theedge of the map.
A 1.38 kg roll-top pack sealed against 20,000 mm of storm. Engineered for ridgelines, rainforests and whiteouts — and tested in every one of them.
- 4.9★★★★★
1,286 reviews - 20Kmm waterproof
HydroSeal shell - ∞lifetime repair
guarantee
Interactive field test
Throw the weather at it.
Drag to rotate the Summit 45. Switch terrain, crank the wind, call in the rain or snow — then run the stress test and watch the shell hold.
Conditions
110 km/h · 60 mm/h · -18 °CInterior stayed 100% dry. Frame flex within 2.1%. Zero buckle failures.
Gear Up →
Five days · 74 km · one pack
The route writes the spec.
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01 · Summit
Dawn above the clouds.
At 2,900 metres the wind never stops. An aluminium perimeter frame and load-lifters keep 18 kg pulled tight to your spine, so every step on exposed granite stays planted.
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02 · Forest
Twelve hours under the canopy.
The Aircell back panel moves air through 3D-spacer mesh channels, cutting back sweat by a third on long, humid climbs through old-growth fir.
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03 · Storm
Sideways rain on the ridge.
HydroSeal 20K, fully taped seams and a triple-fold roll-top. No rain cover, no dry bags — your down stays dry, even when the sky doesn't.
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04 · Lake
Portage to the far shore.
It floats. A sealed main compartment traps enough air to keep a loaded pack buoyant — a safety margin for river crossings and canoe portages.
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05 · Camp
Fire, stars, a dry sleeping bag.
Unroll. Everything inside is exactly as you packed it. Glove-friendly buckles, a hydration sleeve and a stove-ready lid pocket make camp in minutes.
The craft
Every gram earns its place.
Designed in Bozeman, Montana, refined over 41 prototypes and 3,000 field kilometres. Here is what goes into 1.38 kg.
- Shell
- 210D recycled nylon ripstop, HydroSeal 20K coating
- Volume
- 45 L (+6 L roll-top extension)
- Weight
- 1.38 kg / 3 lb 0.7 oz
- Frame
- 7075 aluminium perimeter, removable
- Carry
- Up to 20 kg · torso 41–53 cm
- Hardware
- Glove-sized buckles rated to -30 °C
hydrostatic head — 4× a typical rain jacket
total weight, frame included
of field testing before launch
recycled content by weight
The system
Complete the kit.
Every Alderhorn piece is designed around the Summit 45's volume and attachment points. Add them below and build your kit in one go.
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Ridgeline 2 Tent
Two-person, 1.6 kg, freestanding. Pitches fly-first in the rain.
$449 -
Ember Ti Stove Set
Titanium, 74 g burner. Boils a litre in 3 min 20 s, even in wind.
$119 -
Cirrus -9 °C Bag
850-fill responsibly sourced down. Packs to the size of a loaf.
$339 -
Lumen Light Duo
400-lumen headlamp + warm lantern. USB-C, 60 h runtime.
$89
Field reports · 4.9 / 5 from 1,286 reviews
Tested where it counts.
“Six days on the Wind River High Route, two of them in sideways rain. Sleeping bag came out bone dry every night.”
“The hip belt carries 16 kg like it is nothing. Best-ventilated back panel I have used.”
“Packed it through a January whiteout in the Cairngorms. Buckles still worked with mittens on.”
Ships in 24 h · free returns for 60 days
Gear Up.
The trail doesn't wait for good weather. Neither should you.
Base camp
Questions from the trail.
Still deciding? Our gear guides answer within the hour at basecamp@alderhorn.co.
Is the Summit 45 fully waterproof?
Yes. The shell uses a HydroSeal 20K coating rated to 20,000 mm hydrostatic head, every seam is taped, and the roll-top closure seals the main compartment. You do not need a rain cover.
How much does it weigh and how much can it carry?
It weighs 1.38 kg and is designed to carry up to 20 kg comfortably thanks to its aluminium perimeter frame and load-lifting hip belt.
What torso length does it fit?
The adjustable Aircell harness fits torso lengths from 41 to 53 cm, in S/M and M/L. The hip belt fits waists from 66 to 125 cm.
What is the warranty and return policy?
Every Alderhorn product has a lifetime repair guarantee. Unused or field-tested gear can be returned free within 60 days.
Do you ship internationally?
Shipping is free in the US and Canada, and we ship to 38 countries worldwide, typically in 2–6 business days.