I wrote a fairly long note not too long ago about roller duffle features and designs; it can be found
here.
Having made several trips since I wrote that note, I'll comment on my own message a bit.
- Ziplocs still rule for organizing inside, though I still find having the miscellaneous rubbish (extra batteries, chapstick, etc.) in a small tupper works better when you arrive.
- Weight, weight, weight. The extendable rigid handle, which I regard as absolutely required, adds weight, and I'm not sure it can be gotten below 4# or so and still be durable. A ten pound bag therefore leaves room for 35# of gear, which I find means I have to pack a second bag, which either gets my lights, or my camera tray and flash.
- I'm still not convinced that standing on it's own is absolutely necessary, but it is nice.
- Ditto on backpack straps.
- However, if you do backpack straps, pay attention to where the water will go. I have several "mesh backpacks" that happily water my back or butt (including some that claim not to.)
- Critical design point: if you do not have a rigid end-panel at the wheelie-end, you must design the fabric cut such that if the bag is only partially full while rolled, the loose folds of fabric don't flop over and drag on the ground. The ideal design for this end of the bag would accomplish these three things simultaneously:
- it would be rigid (helping keep the bag's shape and prevent flop) about 3/4 of the way up the vertical dimension.
- it would help the bag stand on end when desired
- it would be able to fold down toward the bag, if you wanted it as flat as possible to shove under a bench or in a hold. I would give up standing-up to keep folding-flat, though I realize that may not be the popular opinion.
Travel tip, depending on the boat/circumstances: I tried a new approach this last trip, that worked fairly well. In the past, I have taken my roller duffle on the boat; it will go mostly-flat to go under a long bench and isn't usually a problem or inconvenience to anyone. This time, when I arrived, I unpacked and repacked so that all the small-stuff was in a small mesh duffle, which went back in the rollerduffle, and then packed the fully-set up BP/W on top, closed the rollerduffle, then strapped the camera on top of the bag using the compression straps. This let me navigate the hotel and gave me one package to handle into the car, but when I got to the boat dock, I left the rollerduffle in the trunk and "backpacked" the BP and carried the mesh and camera in each hand. This worked quite well.
(I keep having this odd thought of a... drycan, or gear-tank, let's call it, that is the same diameter as a tank. You would pack all the misc gear inside it, and then just strap it in place of the tank for all short transporting. Haven't fully thought this out, but if it was fairly rigid (which it would want to be for the strapping-on) it might fulfill the role of protecting checked semi-fragile items (small camera housing, reg, if you're a reg-checker, etc.) either as a small checked (or carry-on) item on it's own, or inside a checked big-soft-bag.) On boat, since it doesn't collapse, it would need to be stowed, but it could actually be stowed in a tank-rack, presuming an available spot.)