Is this a con?

Just received a plastic bag for filling with my unwanted clothing. It is marked ‘please donate, do not delay, www.collectfor4 pink.co.UK,’ it has a pink ribbon motif on it. Looking more closely it seems to be solely for the benefit of screening Lithuanian women, for cancer, who may get £100 per tonne of clothing collected.  My question is - how much would a tonne of clothes raise on the 2^nd hand market in Lithuania and therefore who gets the lion’s share of the money?  There is no UK Charity reference on the plastic bag – do not be conned!  or, am I wrong?