A two-body travel kit — say a Sony A7 IV and an A7 III, one wearing a 24-70mm F2.8 and one a 70-200mm F2.8 — is where compartment size stops being optional. The 70-200 alone is around 200 mm long, so the backpack’s camera compartment has to clear that length in some orientation and leave room for a second body and a standard zoom.
The table above is computed from each backpack’s published interior camera compartment, using the same engine as our fit checker. The 70-200 is almost always the binding item, so watch the compartment’s longest interior dimension.
What separates the bags that fit
- Full-height camera compartments (Lowepro ProTactic, Shimoda Explore, Tenba Axis) give the vertical clearance a 70-200 needs when stood on end.
- Access matters on the road. Rear-panel access keeps the straps clean against your back; side access lets you grab a body without taking the bag off.
- The 70-200 is the tell. If a bag’s interior can’t clear ~21 cm in any direction, it will be “tight” or worse for this kit no matter how the litres read.
How to use this
Start with the “fits with room” rows, then open a bag page to see its exact interior dimensions and the source we cited. If your two-body kit is smaller — two bodies with primes rather than a 70-200 — run it through the checker; a mid-size cube may be all you need.
Fit verdicts are planning estimates from manufacturer-published interior dimensions, not guarantees. Interior dimensions can change between versions, so we date every figure.