Minim Overbag - Primaloft (sale)

Use in combination with your lightweight sleeping bag to boost it by 15°C. It will protect your down bag from getting damp too. 26% off standard pricing
Typical Operating Temperature
Guideline minimum temperature. Sleeping Bag TOT: you should get a night’s sleep, under normal circumstances. Clothing TOT: you should feel warm enough, assuming low/moderate activity. Sleep System TOT: relates to full system. For more details, see our Technical Briefing.
5°C / 41°F
For clothing, weight is for size: M. For sleeping bags, weight changes with selected length/width. N.B. there may be some variation in the weights of finished products.
730g / 26oz
Minim Overbag Synthetic

Using the Overbag + Minim has been a revelation. The two bags interact very well, there is no sensation of multiple layers.
Peter McFarlane, a.k.a 'Petesy', using PHD Combi with a PHD Ultra.



  • 26% off standard pricing
  • "Over-bag" to boost warmth of main bag, or a wide stand-alone bag
  • A synthetic (Primaloft) protective layer to a down bag
  • Cut wide enough to accommodate an Ultra, Minimus, M.Degree bags and the Minim 200/300/450 bags
  • Edge stitched Primaloft for maximum loft
  • Windproof, water-repellent Ultrashell outer
  • Lightweight M1 inner Fabric
  • Hood draws close around the head
  • Colour: Green
  • Oval foot-piece
  • Stuff sack. Packed size 17 x 28cm*
  • Mesh storage bag supplied
  • Set options:
    • Short zip , Long zip (L or R)
    • Slim, Wide widths†
    • Short, Long, lengths†


*Please note: we make our stuff sacs big enough to allow fairly easy stuffing rather than reducing the sleeping bag to the tightest minimum.


Get year-round performance from your Ultralight bag! 

We often get asked by marathon and lightweight enthusiasts about doubling up our Ultralight bags for winter use, like putting a Minimus inside a Minim 400. With the standard bags it is not a good idea - the outer bag would not be wide enough to let the inner expand and you would lose a lot of insulation. Hence the Minim Overbag.

The Minim Synthetic Overbag is a lightweight Primaloft-filled Overbag to extend the use of your ultralight bag into lower temperatures and, in addition, protect down-filled bags from damp. Cut wider to go over the top of an Ultra, Minimus, Minim 400, or our M.Degree bags, this outer bag allows the inner bag to fully loft maximising its insulating potential, with the added benefit of having a synthetic outer to deal with humid climates.

The Typical Operating Temperature (TOT) of the Minim Synthetic Overbag used on its own is 5°C. Used in combination with another bag it will give a lift of 15°C. For example:

Example Combinations Combined TOT
Minim Ultra K Bag + Minim Synthetic Overbag = -7°C
Minimus Bag + Minim Synthetic Overbag = -10°C
Minim 400 Bag + Minim Synthetic Overbag = -20°C
From this sale:  
Minim 300 bag + Minim Synthetic Overbag -15°C
Minim 200 bag + Minim Synthetic Overbag -9°C
Minim 450 bag + Minim Synthetic Overbag -22°C


The versatility and the economies of combining bags need no explanation.

The Minim Synthetic Overbag offers a great opportunity to use your lightweight gear all year.

26% off standard pricing.

Dispatch time: As with all PHD products, these are made to order and by hand. We estimate it will take us around 4 to 6 weeks to make and dispatch sale orders. During busy periods it may take a little longer.


Ultrashell (weight: 40 gsm)

One of the lightest of PHD's coated materials. This ripstop nylon provides complete wind block and good water resistance at minimal weight. Ultrashell gives an excellent upgrade to performance with very little weight penalty.

Lightweight M1 fabric (weight: 39 gsm)

Lightweight silky microfibre. This close-weave 20 denier fabric is fully downproof, but also light and flexible enough to allow the down full loft. A reliable performer that has been the basis for much of our lightweight gear for some time.

Sleeping bag zips

  • No zip: The standard design on our lightest bags with open hoods. The simplest/lightest system which is a must for adventure racers. Up to 140gm (5oz) lighter than a full zip with draft tube.
  • Full zips: Full zip bags ventilate well, so they can be used over a wider range of temperatures.
  • Short zips: Short zips are lighter and pack smaller than full zips. A short zip & draft tube is up to 85gm (3oz) lighter than the full version.
  • Our full briefing on sleeping bag zips.

Primaloft Gold®

Primaloft Gold® is the ideal microfibre insulation. Ultrafine fibres produce an insulating core that is incredibly soft, lightweight and water resistant. In our experience it absorbs water much more slowly than other waddings, a marked advantage in wet-cold conditions.

The nearest of the synthetics to the feel of down, yet tougher than you would expect. Primaloft Gold® offers the best warmth/weight performance in the Primaloft range

"The fit is very good, no crushing of the inner bag ... and the loft is very good ... The fabrics are all excellent, the outer used on the Overbag is very good indeed. Water resistant enough to cope with spills, drips and a user daft enough to keep dragging snow into the tent ... the Overbag + Minim has been a revelation. Warm enough for me to abandon all clothing bar my coating of 190 weight merino, and although slim cut, I don't feel restricted in it. The two bags interact very well, there is no sensation of multiple layers ... The two bags feel like one, but it's somehow cosier. I dare say it's one of those things that you have to try, but I have to say I have been warm, comfortable even delighted using these bags ... I think it's good to look at the two bags as a system and as individual bits of kit. That way it does kinda cover the whole year, does that mean it's all you need?"
Peter McFarlane, a.k.a 'Petesy', using PHD Overbag with a PHD Ultra.

"Just back from an 18 day trek in the region around Everest. I knew the conditions were going to be pretty cold, camping for quite a few nights at around 5000m - night temperatures fell well below minus 15c. Just before I left I purchased the synthetic Combi bag to go with my Minim 400. The combination worked a treat and - with my Ultra down vest - I never once felt cold during the long nights - even without the hood done up fully. Everything else froze - condensation from my breath turned to ice on the inside of the tent! I was the only one to have such luxury and my trekking companions were just a little envious of my warm glow!"
Gordon G.

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