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  • Osprey Packs - Ultralight Stuff 18L Backpack -

Osprey Packs Ultralight Stuff 18L Backpack

Temporarily Out Of Stock

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5 Reviews


Works anywhere in the world.

Osprey's Ultralight Stuff Pack has the room you need for a day's worth of gear whether you're hiking, multipitch climbing, or traveling across foreign cities. Stow the Ultralight Stuff Pack inside itself and pack it up in bigger climbing packs, then take it out after the approach and when it's time to ascend the hundreds of feet above you. The air mesh back panel uses minimal padding and breathable fabrics to keep your back comfy throughout. There's a top zippered stash pocket for valuables, and a stretch side pocket for water bottles.
  • Air mesh back panel
  • Stretch mesh side pocket
  • Top zippered stash pocket
  • Ultra compact storage
  • Item #OSP004F

Tech Specs

40D nylon ripstop
18L (1098cu in)
air mesh
top panel
1 stretch side, 1 zippered top
4 x 4 x 2in
Claimed Weight
Recommended Use
travel, climbing, hiking & camping
Manufacturer Warranty

Tech Specs

  • Reviews
  • Q & A

What do you think about this product?

Have questions about this product?

Great for bicycle commuting, nice design

  • Familiarity: I've used it several times

I got this pack for commuting by bike and it's almost perfect, especially for the price. Feather light, comfortable, and great zipper construction. It could use a chest strap. The 'almost' is because the "Air mesh back panel" got my hopes up for better ventilation, which was something I was looking for.

Don't bother

  • Familiarity: I've put it through the wringer

The pros:

Lightweight - packs extremely small

The cons:

No support

No chest strap (can't run easily with it)

NOT durable

Water bottle pouch useless - will drop your standard Nalgene bottle

I've taken this bag on a few backpacks to the Adirondacks, as well as an occasional bike ride here or there. I tried taking it on a winter run to hold a layer and some water but ended up just holding it in my hand for the duration.

Regarding the durability of this bag. I've had this bag for a little over a year taking it on occasional trips. I found I can't store my keys in the bag without it poking holes in the bottom. Finally after my most recent bike ride with the bag, the whole bag ripped open at the seam.


I'll trade it for a drawstring bag

Don't bother

Hey Leta,

You bring up the good point that this bag is not meant for active use. I find it hard to use it with almost all of my active sports, including hiking.

I understand the trade-offs of lightweight packing. The lack of padding is definitely a trade off with the reduced weight and size. You could however find a chest strap and a working water bottle pouch on a number of other ultralight packs.

Check my original post for an updated picture of the key holes.


great light backpack!

  • Familiarity: I've used it several times

bough this for a 10 day hiking trip in Canada and it was perfect for carrying items for a several hour or half day hike. i put sunglasses case, water, hand wipes, gloves, tissues, camera, and layers. Filled to capacity it did start to give some mild neck discomfort from the straps, but this was only because I think it was overfilled. for a less-full pack, it is very comfortable.

Instant storage!

  • Familiarity: I've put it through the wringer

Super stoked on this pack! I use it for the light commute to work, and for the extra packable storage when bikepacking. My favorite use of it so far, is when I need to run errands after wanting to get a ride in...It packs up nicely into my jersey pocket for the ride, then poof!, instant grocery bag!!