Don't use travel as an excuse to let your grooming go to hell. Instead, bring your routine with you with these flat-pack carriers. The soap case does exactly what you think it would - it holds a bar of soap - with a roll-top buckled closure and dry-through tech to let your bar dry out. Meanwhile, the simple toiletry pouch will hold any liquid and fills via the wide-mouth opening. They're both waterproof and leakproof to keep your duffel bag shampoo-free — and they're TSA-approved so you won't have any trouble with security.
FlatPak Toiletry Bottle
FlatPak Soap Bar Case