I brought a very nice little day/weekend pack from MacPac yesterday, it weighs in at 189g and measures around 50cm tall 20cm wide and 17cm thick. I think the volume is around 20 liters (I hope Blacksheep will confirm this)
What I really like about this pack is that I can fit my closed cell foam sleeping matt inside, coiled up so I can fit my gear inside the matt therefore using the matt as back support , I can also do this with my Thermarests inflatable matts. Most other 20 liter day packs I am unable to do this.
I am hoping to use this pack for up to 3 day summer walks.
Tony
WARNING:
Please be very careful when you start lightweight bushwalking.
The lightweight approach to lightweight bushwalking equipment described below is intended for a limited scope of environmental conditions and should not necessarily be relied upon in extremes of temperature or weather. Even during the heat of summer, the Australian Alps and South West Tasmania can offer snow and sub-freezing temperatures. You should be confident that you can use your equipment to deal with these conditions.
Therefore: You should not take a lightweight kit into high-mountain areas like the Australian Alps, or South West Tasmania without the knowledge and experience to use it. Not having the appropriate equipment, or unfamiliarity with lightweight backpacking techniques, could result in serious discomfort, injury, or death.
As with any serious outdoor pursuits, take your time learning and gaining experience: lighten your kit a bit at a time with judicious testing on short outings and in your backyard. Take backup equipment until you have confidence that your ultralight equipment will keep you warm and safe.
