Design Your Own Superlight Sleeping Bag

For ultralight racers and backpackers travelling fast and light where night-time temperatures remain 4°C or warmer.
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Design your own Superlight down sleeping bag

Easy, quick, and fun to use ... very well-designed ... provides the opportunity for a customized bag that is exactly what you want.
Chris Townsend in



  • Temperature Range: from +6°C to +11°C (depends on your choice of down-fill)
  • Price range: £435 to over £1000 (depending on options selected)
  • Weight range: from 200g (7oz) to 765g (27oz) depending on options selected
  • Box wall construction on top for maximum loft
  • For maximum weight saving, the base of the bag has a stitch-through construction
  • Side block baffles to keep down above and below the body separate
  • 3 Outer fabric choices
  • 2 Inner fabric choices
  • Multiple zip options
  • 5 Length options
  • 4 Width options
  • Choose down stuff pattern (e.g. more down at the bag's base if you get cold feet)
  • Choose to add an internal security pocket
  • Choose an open hood, or a close-fitting mummy-style hood
  • Add a down-filled collar to cut out drafts
  • Add a foot zip
  • and much more...



For those wanting minimum pack-weight for mountain marathons, ultra-races, and ultralight backpacking or trekking, this is the design to choose. The lightest possible sleeping bag for use in temperatures above 4°C.

The wide opening at the hood means access is easy without the need for an entry zip (short and long zips can be added).

Cut is close fitting. Standard width: chest circle approx 152cm; waist circle approx 134cm (wide and extra-wide versions are also available).

For maximum weight saving, the base of the bag has a stitch-through construction. The top is insulated with a straight wall baffle system, the lightest of all baffle systems. The stitch-through base means that this bag, more than the others in our Design Your Own range, relies on the insulation provided by your sleeping mat.


"Easy, quick, and fun to use ... very well-designed ... provides the opportunity for a customized bag that is exactly what you want."
—Chris Townsend in

"Fantastic ... easy and fun to use ... well-thought out ... the range is enormous ... of value to everyone but particularly those who find standard sleeping bags the wrong shape or size."
—TGO Magazine

"I just wanted to let you know how pleased I am with my new [Design-your-own] sleeping bag. I used it on the LAMM and I heard lots of people say next morning that they had been cold - and I was snuggly warm. I also had a tiny rucksack compared with my partner - thanks in large part to my ultra light (and gorgeous) sleeping bag."
—Kate O'Donoghue

"Just to say that we’ve been absolutely loving our DYO sleeping bags these past few months in New Zealand. Cannot fault them - absolutely wonderful and frankly I don't know why I would ever sleep in anything else ever again!"
—Vanessa Barnett

"The online option to design and order your own sleeping bag, with 17 different variables, is wonderful."
—Tim Jepson, The Sunday Telegraph

"Down-bag maker PHD ... will stitch a sleeper to match your idea of the perfect bag for your body and your wilderness sleeping plans."
—Outside Magazine

"I don't have to go to dozens of stores to find the perfect sleeping bag; I go to a PHD, where I can customize everything in a sleeping bag, down to the fill pattern and which side it zips open."
—Quinton Hamel, Credit Union Times

"[Yours] is the most awesome piece of 'Design your own sleeping bag' software that I've ever seen."

"Just been pointed to your website, looking for a decent sleeping bag for Aconcagua & Himalayas. Just wanted to say that i found the website in general and the design your own bag section in particular, to be fantastic. Have spent over an hour designing (& re-designing) a bag, and still trying to make my mind up, too much bloody choice ... ! Anyway, glad to see a British company making world class gear, keep up the good work."

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