A tote bag is the perfect workweek and weekend carryall. Most totes have plenty of room for all your essentials plus work documents and a tablet.
If you're a thrifty spender, your best bet is this Lauren Merkin Tote Bag. It's a wonderful product, while not very costly. Another savvy option is this Big Buddha Tote Bag. While the price is not too high, be sure that this product will become a worthy addition to your wardrobe. You might also want to consider this Tote Bag. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.