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The original was posted on /r/Ultralight by /u/Available-Pilot4062 on 2025-09-15 19:03:04+00:00.

Inspired by u/Belangia65 and their great trip reports and SUL loadouts, I ordered a custom KS Imo. This pack is 18 liters with an additional 5 liters in the front pocket, and weighs 5.4 oz! A major decrease in size and weight from my Gossamer Gear Kumo 36L, which is slightly over 1lb.

KS Imo Backpack: Pics here

Specs: 70D, no hip belt, no lid, bungee to slide in a sit pad on the back. Imo front pocket also in 70D.

Weight: 152g

Cost: $150 including shipping, but I also had to pay ~$30 in tariffs

Time: About 4-6 weeks

Note: You could go more minimal, but you’d lose the front/side pocket which is very useful. Without a brain or any other pack organization, that front pocket was important for me.

Loadout and shakedown trip:

Base weight: slightly under 4lbs

I dont use Lighterpack, I track everything in excel. I use: Zpacks Plex Solo, 40F EE quilt, Nemo Tensor Elite short, no stove, no spare clothes, etc. And on this trip didnt need rain gear, warm gear etc. With food and 2L water for an overnight, total weight was 10.5lbs.

I did a point-to-point overnight 25 mile hike on the West Rim of Zion, from Lava Point passing through Hop Valley and Kolob Canyons.

Overall

Carried 10lbs fine, and I assume would be fine with up to 15lbs. I had around 25% of the pack empty, but if I had a 20F quilt and fleece or puffy, or if I was carrying 3+ days of food, it would be full. Doubt it can carry a bear can either.

I have bigger packs for when I need 30L+, but this was a fun challenge…to see if I could go SUL for short trips under easy conditions (summer, water sources, just 1 night etc).