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Beschoi Waterproof Camera Bag with Tripod Strap and Rain Cover Large Capacity Rucksack for Digital SLR Camera
SKU: 813010019V1
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The details on the bag says; “ 【15.6 inch laptop compartment】 The padded upper compartment offers space, especially for laptops, MacBooks and tablets up to 15.6 inches.”
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Yes it will
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That's still possible, think from 4 kg it will be noticeable that it will be difficult in the long run
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Yes Should fit in. the compartment is 22cm wide at the top so your lens should have enough space.