Quechua Forclaz Symbium - Weeklong Packs (Over 4500 cu in)
Galas Backpacks - Despite a rather silly name this pack is a pretty good buy. It's big, though not the biggest on the market, comfortable, packed full of features and pretty inexpensive
Forclaz Men's MT900 SYMBIUM 70+10 L Backpacking Pack | Decathlon