While in Germany and Spain, I discovered this trendy fashion/life goods brand with yuppie minimalist designs. They currently have a sale for two very useful items:
Standard size backpack with water repellent fabric and "smart strap" for luggage handle attachment
Ultra lightweight shoulder bag with "smart strap" for luggage handle attachment
I have the second item. It is the lightest bag I have ever had and looks pretty nice. It's not a good idea to check it in, but I bring it to Europe as an extra bag in case I do too much shopping.
In addition to good bags, Muji also makes very good clothing, esp. their French linen line. I bought some while in Madrid and Berlin at very reasonable prices. Sizing is not generous--they don't make plus sizes. Got a 100% French linen (super soft!) dress for EUR29. The same dress would have cost me over $100 here in the US.