Marmot's Big Basin Daypack is large enough for field work and convenient enough for office work. This daypack has plenty of space for layers, dirty work clothes, meals, and more. There's also a padded sleeve that protects your laptop, as well as a separate sleeve for tablets or E readers. The external stash pocket is also convenient for dirty work clothes, if you don't want to dirty the main compartment, and there are side pockets for water bottles.
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