Single shoulder bag

[Blue]

+1 here.

They have a variety of sizes.  I use one for both my pedal cycle and on the moto.  carries clothes, school books, laptop, work materials easily.  Tightens/looses one handed, and never moves when fit properly

I have used the same Timbuk2 messenger bag for the last 10 years commuting to work via bicycle and motorcycle without any trouble. 
It is large enough for my lunch and my laptop.
At the end of the day, my laptop and a six pack (with the bottles out of the holder) can come home with me!   
What else do you need?
It has been a great bag with zero issues. [moto]

[mysticbluex3]

Dainese Laptop Bag.  $99.  Has shoulder strap plus an additional strap that goes around your waist to prevent the bag from flying back.

I personally would rather go w/ the Ogio No Drag Backpack.

[IZ]

^^ Saw that Dainese bag at CycleGear.   

[mysticbluex3]

^^ Saw that Dainese bag at CycleGear.   

What didn't you like about it?

[Monster Dave]

For around town commuting I have a few suggestions -

For the single shoulder bag I use one very similar to this one (I found at Target):



It slides a little, but it's not bad and it works fairly well.

The other suggestion that I have and it's one that I've grown quite fond of is using retired the High Sierra Camelback bags that I've picked up cheap at Costco (retired because I've removed the water bladder).



I've used that for long trips and it never moves, and keeps my things compactly packed in a slim bag that really doesn't weight that much.

Here's a detailed review on another motorcycle forum of the exact one that I have:

http://www.advrider.com/forums/showthread.php?t=330288

For $19.99 you can't hardly beat that!!

[djrashonal]

I use this for everyday commuting and it's amazing!
http://www.ospreypacks.com/Packs/ReSourceSeriesRecycledMaterials/Elroy/

The Osprey Elroy

great construction, pockets galore and expandable.

[redxblack]

a lot of us are fans of the kreiga packs. They're two strap bags, but different than most backpacks. They were engineered for motos. It's worth a look.

[M900]

I have used the same Timbuk2 messenger bag  
At the end of the day, my laptop and a six pack (with the bottles out of the holder) can come home with me!  
What else do you need?

my timbuk2 holds 2 six packs and my old Vaio.

[10/10ths]

I own one of these:

http://www.aerostich.com/aerostich-courier-bag.html

I love it.  I wore it on my Monster for three years with a 45 mile commute each way.

I will also vote for the Kriega backpacks if you want a full pack.  The Kriega is engineered for motorcycling.

The Aerostich courier bag is also engineered for motorcycles.  It is an awesome piece.

Cheers.

[enderwaves]

I've used both Timbuk2 and Chrome bags for years. The chrome strap is more comfy, but also more hot. I let it slide because the seatbelt fastener is really handy when you have a helmet on. My metropolis has lasted 10+ years of bicycle messengering, scooter rallies, school, and a trip to Asia. I've (uncomfortably) fit a case of beer and 2 bottles of liquor in it. Bonus, if you fill it up with ice it can work as a pretty decent cooler in a pinch. Somehow it still looks reasonably new.

[696DCRider]

I bought a Chrome bag 4 years ago for use on my bicycle, but also use it on my motorcycle.  I don't use the waist strap, but it has never shifted on me either.  I love that thing.  It's water proof too, so I don't have to worry about getting caught in a storm and messing up my stuff.

[skurvy]

I've been using a Timbuk2. You can custom build one here (http://www.timbuk2.com/tb2/custom), pick your colors and they have cool reflective materials if you wanna be seen at night.

Timbuk2 Nightrider Messenger

[thought]

i mostly use backpacks, ogio no drag and a kriega r30, but i do toss on a smaller single shoulder bag if i just need something to carry something small.  i use this normally:

http://www.lapolicegear.com/tabaoutbag.html

that being said... i really dont like using single shoulder bags all too often.  what bothers me is that if i do have a off, i dont like the idea of something around me neck that could easily drag and put a lot of pressure on it.  having it get caught on something and yank back hard is what i think about when i'm riding.

overall, in terms of safety... i'd just get a good backpack and stick with it.

[d3vi@nt]

I use an inexpensive (Jansport, I think) shoulder bag for commuting and errands. It has a waist strap, but I never use it. I rarely hit 40+ on these runs and I've never had an issue with it flapping.  If not adjusted correctly it does tend to slide a little bit of my back, but I just reach around and adjust it.  The biggest pain is that I have to take my helmet off to take the bag off, but I like that I can swing the bag around and get into it easily. Also, you have to make sure the strap is adjusted short enough that the bag sits on your back and doesn't get hung up on the seat behind you.  I think too large a bag will be uncomfortable, and it doesn't take much weight before it becomes uncomfortable particularly on longer rides.

[Steve.In.Atlanta]

For single strap I've loved my Chrome bag I picked up 10 years ago. It's XL and I've used it on bicycles, scooters and bikes. I've never had a problem with it moving around when I use the chest strap.

As for what it can carry, I can squeeze 2 12-packs of Fat Tire bottles in the boxes into it. What more does it need to carry?