If
you're a dedicated jigsaw puzzler, and don't live in a large mansion with
a good-sized room set aside just for jigsaw puzzles, you probably need a jigsaw
puzzle mat.
The idea is simplicity itself - you assemble your puzzle on the mat, which is a sort of felt. Whenever you need to, you roll it up and secure it with attached straps. Then unroll it when you're ready to go back to work assembling your jigsaw puzzle.
One other indispensable accessory for puzzles that we should mention - puzzle glue!
Puzzle glue isn't always easy to find, but it is exactly what you're looking for to preserve a jigsaw puzzle once the puzzle is completed.

Copyright American Jigsaw Puzzle Society