I wonder if shrink wrapping would work well for that. Here is a company I've been looking at to expand my packaging possibilities. I like that they have a biodegradable option.
http://www.nationalshrinkwrap.com/home.html
You may already know this, but I thought it might be good info for others as well. With guest size bars you don't have to list ingredients under USA cosmetic label laws. If you sell the guest size bar retail & make cosmetic claims then you would need to.
21 CFR 701.3
"Cosmetic ingredient labeling became an issue in the early 1970s. Guidelines for ingredient labeling were published in mid-1972. Regulations were proposed in early 1973. After publication of two final regulations, stays of final regulations, terminations of stays, and lengthy court proceedings challenging the legality of the published regulations, the requirement for cosmetic ingredient labeling became fully effective in early 1977.
The regulations requiring the declaration of cosmetic ingredients were published under the authority of the FP&L Act [secs. 5(c) and 6(a); 15 U.S.C. 1454 and 1455] and FD&C Act [sec. 701(e); 21 U.S.C. 371(e)].
Since the FP&L Act applies only to consumer commodities and their packages as defined in the Act, cosmetic ingredient declarations are required only on the label of the outer container of cosmetics customarily sold at retail or used in the performance of services conducted within the households.
It does not apply, for example, to products used at professional establishments or samples distributed free of charge, unless such products are customarily also sold at retail, even if they were labeled "For professional use only."
The ingredients must be declared in descending order of predominance. Exceptions to this requirement are discussed later."
