I have used HP5+ from a foil packet before, you can find them when you get 8x10 paper with a few rolls as a bonus.
When I travel with a fair amount of film, its actually easier to take off the paper box, and the plastic canister, and toss the film into thick ziplocks. It saves so much more space.
But I am very thankful of the plastic canisters, esp the ilford ones where the cap is streamlined to the edge of the container since they bag neatly when I reroll and freeze them. The kodak type though a bit easier to remove the cap, have a protruding flange that takes up a bit of space which doesnt make neat packages in ziplock bags.