What size day sack does everyone have?

I'm after a new one, but can't decide on what size i should get. I was thinking of either the Osprey Helios 26, or the Marmot Eiger 36 (which actually looks bigger than that), they're both the same price, and i can't help feeling that the Marmot will give me more for my money...

My day sack is a 25 l and its big enough but only just, If you think you may sometimes need that little extra space get the bigger size.
Mostly go for comfort, and get them to put some weight in your sack when you try it on.

Too many, but mostly for cragging a 40-litre Lowe Alpine Alpine Attack and for walking, more general stuff, a Berghaus 64Zer0 which is, I guess, about 25 litres. Depends a lot on how light and compact the rest of your kit is.

Recently was chatting to one of the Berghaus guys who was off to the Dolomites and using a Bladdered hydration sack as a day pack. He was moving very light with just food, water and Paclite shell clothing, but it makes the point really.

A 28 litre Camelbak Rim Runner. It's got a 3 litre bladder built in which is nice. It's plenty big enough for a full day in the hills.

I do notice that it's not upto the job of carrying heavier loads. I stuffed it full of duty free booze coming back from holiday and the back system wasn't too comfortable with the 15kg weight. Also, I kept feeling bottles of whiskey digging into my back but a few drams soon eased my comfort worries. :-)

Spooky, both Michele and I mainly used our 'Bladdered' sacks in the Dolomites this year, we also managed to fit the via ferrata kit in as well.

I use a 25 litre daysac in summer and a 35 litre daysac in winter (can just about get summer backpacking stuff in this for one night too). For longer backpacks I use a 65 litre sac.

35 in summer for day or 2 day trips, 45+10 for the same in winter.

I do a lot of walking alone so I can't often share cooking equipment/shelter etc

28 Litre Daysack for day walks in both summer and winter, although if I'm carrying a lot of gear in winter (ropes etc) then I'll use a half filled backpacking bag (actual volume unknown, conservative estimates around 85 litres).

40 L daysack with good compression facility for day or overnighters.
60+10 for long backpacks.

I would like a smaller daysack but I'll only get one if it jumps up and pokes me in the eye, so to speak. Till then I'll make do.

I'm not a sack-o-phile.

35 l for summer day walks, 50 l in winter - I do a lot of lone walking in the Cairngorms where you can see only one or two people all day so I stuff the spare space with extra warm & dry gear, survival kit etc etc. Good compression straps a must

Oh, and the 50 has enough strappage for tent etc and so is big enough for a two or three night wild camp trip. If I had to just have the one it'd be a 50 litre with, yup, extra good compression straps

I'm using my 10 litre Osprey Solo a lot, perfect for inline skating in the city, and running or walking in the outdoors when your're only out for the day. Takes a 2 litre platypus bladder, lunch, snacks, rain/windshirt, microfleece and the rest I may want to bring along, including small camera, map etc.

Lowe Alpine South Peak 30L for dayhikes winter/summer, and lightweight weekends in both summer/winter...If I need to bring ropes etc, I use the larger bag which is about 65...

30L (Contour Event) for summer, and a lovely Berghaus Extreme Guide for winter in at 50L . That works for summer backpacks, but for longer, a 65L does the trick with plenty to spare.

35ltr Karrimor ridge for most of the year but its pretty heavy on its own so got a 30ltr lightweight for the summer. For the winter, backpacks and any other time really I've got a Karrimor Alpine Lite 45+10 which swallows everything you could ever need and is really comfortable full or nearly empty.

As someone said earlier, getting the shop to put some weight in rather than scrunched up plastic is good advice.

All day trips, including winter: Cactus Climbing Alpine Henry (strange but true): 28 litres. Also used for mountain marathons and bivvying. About 600g

All backpacking trips and winter climbing, plus more serious ski tours: Lowe Alpine Alpine Attak 50. About 1500g.

Not used for the last 2 years: POD Expedition sack. About 3kg. Doh!

This summer I have been mostly using:

Karrimor 10 litre hydrolite bumbag
Karrimor 15 litre hydrolite rucksack

I might need to go to my 21 litre rucksack for winter.

Have given up backpacking as I plan to pay for extra masses instead.

This last year I have been mostly using:-

- a Karrimor 20ltr Rush Air biking rucksack for summer day walks, it has a very handy pocket for a hydration pack.

- KIMM 35 ltr rucksack the remainder of the year. More than adequate space wise, but being an adventure rucksack it hasn't got ice loops ec. to be a full winter sack. I'll was recently looking at 40 ltr Berghaus sack for that job, as the only other sack I've got for this job is a 65ltr Vango. Way too big most of the time.

I find the bigger the rucksack, the more you'll carry to fill the space.

Lowe Walkabout 45L all year round, bit big for summer on my own, but I wind up carrying for the whole family a lot of the time.

One of these days I'll treat myself to a 30L daysack for solo walks.

Carrying for the family? My kids always had a tiny sac with their waterproof and a butty in. Reminds me of those girlies who skip along with no bag while their boyf carries everything for them. Nice idea in principle but I never met anyone prepared to offer.....