Day walks, we carry bottles and proper glasses.
OK So it's time to be a little indulgent.
Some photos are thumbnails, clickable to larger images - hovering the mouse over the pic turns the arrow into a little hand, indicating the image is clickable.
Day walks include:
Montezuma, 10-2-2004 (Barringwood Park Forest Raven Pinot 2001)

Dove Lake, 25-7-2004 (Lake Barrington Alexandria sparkling 1998)

Cashs Lookout, near Eaglehawk Neck, 29-7-2004 (Yellowglen sparkling 1992)

Solomans Jewels, near Herods Gate (Walls), 16-8-2004 (Bream Creek Pinot 2001)

Marions Lookout, 21-8-2004 (Springvale Chardonnay 1999)

Meander Falls, 28-8-2004 (Ninth Island Riesling 2001)

Lees Hut (first trip), 16-1-2005 (Moorilla Cabernet 2000)

Apsley Gorge, 5-3-2005 (Veuve Clicquot very posh french stuff)

Later that day at Angasi, Binnalong Bay (Penfolds Grange 1972 and old Blass Langhorne Creek 1972)

Cradle Mtn summit, 25-3-2005 (Pipers Brook Pinot 2001)

Following the river toward Montezuma Falls (off-track), 26-3-2005 (Wellington Pinot 2002)

Artists Pool, 30-3-2005 (Sandalford W.A. Cabernet)

Grail Falls, 10-4-2005 (Ghost Rock Pinot 2002)

2nd trip to Montezuma, 3-7-2005 (Lanson posh french stuff, Holm Oak 1995 Pinot, Penfolds St Henri Shiraz 1991)
Blue Tier, 23-7-2005 (Meadowbank Mardi again)

Beerbarrel Beach track, St Helens, 24-7-2005 (Pipers Brook Pirie sparkling 1998)

Winifred Curtis beach, 25-7-2005 (Freycinet Radenti 1998 sparkling)

Black Bluff, 27-8-2005 (Pipers Brook Cuvee Clark),

Mother Cumings, 12-10-2005 (Barringwood Park Pinot Gris)

I wasn't actually on that walk, so I made up for it that evening with... More posh french stuff

2nd trip to Lees Hut, 5-1-2006 (Lake Barrington 1998 Riesling, Meadowbank Henry James Pinot 2002)

Grail Falls, 26-1-2006 (Meadowbank Mardi sparkling again)

Mt Roland, 20-5-2006 (Barringwood Park Pinot)

Lake Bill, 1-6-2006 (Meadowbank Pinot, with a Holm Oak in reserve)

Not really a walk, but on the Western Explorer, 25-7-2006 (Lake Barrington Alexandria 1998 again)

Projection Bluff, 12-8-2006 (A cabernet blend from St Huberts)

Suttons Tarn, 30-8-2006 (Shaw Vineyard Estate botrytis, Canberra region)

Lady Lake, 26-1-2008 (Pipers Brook Pinot 2001 again)

You get the idea. So many more...
For overnight walks, I've only taken wine twice. Once was in a plastic 1 litre water bottle, never again as it tainted the wine. The other time was an old cask bladder - not very successful at filling it as it was a poor design spout.
Had to resort to buying a 2L cask of muscat to see if I can get a better bladder that will be easier to refill so I have a vessel for overnight walks.