Design Your Own Hi-Tech Down Sleeping Bag

Design Your Own Sleeping Bag for full-on expedition work. Provides a secure base however long and hard the venture.
Price From:
Design Your Own Hi-Tech 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 -5°C to -69°C (depends on your choice of down-fill)
  • Price range: £889 to over £2770 (depending on options selected)
  • Weight range: from 825g (29oz) to 3512g (124oz) depending on options selected
  • Box wall construction for maximum loft
  • Close-fitting mummy-style hood
  • Down-filled collar to cut out drafts
  • Side block baffles to keep down above and below the body separate
  • 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 water-resistant inner panels to protect bag from damp at feet or around the head
  • Choose to add an internal security pocket
  • Multiple zip options
  • 2 Outer fabric choices
  • 3 Inner fabric choices
  • and much more...


This design is suited to expedition use, whether in high mountains or high latitudes right up to the poles. With the right downfill this bag can protect you down to temperatures below -64°C (-83°F).

The design has a close-fitting down-filled mummy hood, and side V-channels which ensure all areas of the body are insulated. The baffles over the chest are vertically aligned, which stops any horizontal shifting of the down caused by arm movement during the night.

Width: Standard size: chest circle approx 162cm; waist circle 144cm.

PHD’s trapezoid baffle system is used throughout. This is the best of the technical baffle systems, combining excellent down control with low baffle weight.

"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."

Works well with
From £875.00 579g
Technical lightweight mountaineers’ and explorers’ design for seriously...
From £527.00 302g
Ideal for lightweight backpacking, mountain marathons and trekking in all seasons. Just...
From £1,153.00 725g -38℃
A superlight high-altitude mountaineering and polar jacket for light ascents and fast...