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If you dont have a design in mind, the Spirit Factory in-house design team can make recommendations and help you design one

seaforthraingear.com Rain Wedge is better if you don't mind the space it takes (coils to the inside of a big pocket)

Tamrac Anvil 27 Pro Camera Backpack (US$ 269.95) The Tamrac Anvil 27 Pro Camera Backpack offers a range of features to keep gear within easy reach, including a wide-opening clamshell-style main compartment, dedicated laptop compartment, and quick-access exterior pockets

Here's some specific suggestions to that end: Generally, lighter-weight items go at the bottom with heavier items near the middle and close to your body